aboutsummaryrefslogtreecommitdiff
path: root/gitk
blob: 2e0450437f0aa8dc2b04f1a878d588a5069e24e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
exec wish "$0" -- "$@"

# Copyright (C) 2005 Paul Mackerras.  All rights reserved.
# This program is free software; it may be used, copied, modified
# and distributed under the terms of the GNU General Public Licence,
# either version 2, or (at your option) any later version.

proc gitdir {} {
    global env
    if {[info exists env(GIT_DIR)]} {
	return $env(GIT_DIR)
    } else {
	return ".git"
    }
}

proc start_rev_list {view} {
    global startmsecs nextupdate ncmupdate
    global commfd leftover tclencoding datemode
    global viewargs viewfiles commitidx

    set startmsecs [clock clicks -milliseconds]
    set nextupdate [expr {$startmsecs + 100}]
    set ncmupdate 1
    set commitidx($view) 0
    set args $viewargs($view)
    if {$viewfiles($view) ne {}} {
	set args [concat $args "--" $viewfiles($view)]
    }
    set order "--topo-order"
    if {$datemode} {
	set order "--date-order"
    }
    if {[catch {
	set fd [open [concat | git-rev-list --header $order \
			  --parents --boundary --default HEAD $args] r]
    } err]} {
	puts stderr "Error executing git-rev-list: $err"
	exit 1
    }
    set commfd($view) $fd
    set leftover($view) {}
    fconfigure $fd -blocking 0 -translation lf
    if {$tclencoding != {}} {
	fconfigure $fd -encoding $tclencoding
    }
    fileevent $fd readable [list getcommitlines $fd $view]
    nowbusy $view
}

proc stop_rev_list {} {
    global commfd curview

    if {![info exists commfd($curview)]} return
    set fd $commfd($curview)
    catch {
	set pid [pid $fd]
	exec kill $pid
    }
    catch {close $fd}
    unset commfd($curview)
}

proc getcommits {} {
    global phase canv mainfont curview

    set phase getcommits
    initlayout
    start_rev_list $curview
    show_status "Reading commits..."
}

proc getcommitlines {fd view}  {
    global commitlisted nextupdate
    global leftover commfd
    global displayorder commitidx commitrow commitdata
    global parentlist childlist children curview hlview
    global vparentlist vchildlist vdisporder vcmitlisted

    set stuff [read $fd]
    if {$stuff == {}} {
	if {![eof $fd]} return
	global viewname
	unset commfd($view)
	notbusy $view
	# set it blocking so we wait for the process to terminate
	fconfigure $fd -blocking 1
	if {[catch {close $fd} err]} {
	    set fv {}
	    if {$view != $curview} {
		set fv " for the \"$viewname($view)\" view"
	    }
	    if {[string range $err 0 4] == "usage"} {
		set err "Gitk: error reading commits$fv:\
			bad arguments to git-rev-list."
		if {$viewname($view) eq "Command line"} {
		    append err \
			"  (Note: arguments to gitk are passed to git-rev-list\
			 to allow selection of commits to be displayed.)"
		}
	    } else {
		set err "Error reading commits$fv: $err"
	    }
	    error_popup $err
	}
	if {$view == $curview} {
	    after idle finishcommits
	}
	return
    }
    set start 0
    set gotsome 0
    while 1 {
	set i [string first "\0" $stuff $start]
	if {$i < 0} {
	    append leftover($view) [string range $stuff $start end]
	    break
	}
	if {$start == 0} {
	    set cmit $leftover($view)
	    append cmit [string range $stuff 0 [expr {$i - 1}]]
	    set leftover($view) {}
	} else {
	    set cmit [string range $stuff $start [expr {$i - 1}]]
	}
	set start [expr {$i + 1}]
	set j [string first "\n" $cmit]
	set ok 0
	set listed 1
	if {$j >= 0} {
	    set ids [string range $cmit 0 [expr {$j - 1}]]
	    if {[string range $ids 0 0] == "-"} {
		set listed 0
		set ids [string range $ids 1 end]
	    }
	    set ok 1
	    foreach id $ids {
		if {[string length $id] != 40} {
		    set ok 0
		    break
		}
	    }
	}
	if {!$ok} {
	    set shortcmit $cmit
	    if {[string length $shortcmit] > 80} {
		set shortcmit "[string range $shortcmit 0 80]..."
	    }
	    error_popup "Can't parse git-rev-list output: {$shortcmit}"
	    exit 1
	}
	set id [lindex $ids 0]
	if {$listed} {
	    set olds [lrange $ids 1 end]
	    set i 0
	    foreach p $olds {
		if {$i == 0 || [lsearch -exact $olds $p] >= $i} {
		    lappend children($view,$p) $id
		}
		incr i
	    }
	} else {
	    set olds {}
	}
	if {![info exists children($view,$id)]} {
	    set children($view,$id) {}
	}
	set commitdata($id) [string range $cmit [expr {$j + 1}] end]
	set commitrow($view,$id) $commitidx($view)
	incr commitidx($view)
	if {$view == $curview} {
	    lappend parentlist $olds
	    lappend childlist $children($view,$id)
	    lappend displayorder $id
	    lappend commitlisted $listed
	} else {
	    lappend vparentlist($view) $olds
	    lappend vchildlist($view) $children($view,$id)
	    lappend vdisporder($view) $id
	    lappend vcmitlisted($view) $listed
	}
	set gotsome 1
    }
    if {$gotsome} {
	if {$view == $curview} {
	    layoutmore
	} elseif {[info exists hlview] && $view == $hlview} {
	    vhighlightmore
	}
    }
    if {[clock clicks -milliseconds] >= $nextupdate} {
	doupdate
    }
}

proc doupdate {} {
    global commfd nextupdate numcommits ncmupdate

    foreach v [array names commfd] {
	fileevent $commfd($v) readable {}
    }
    update
    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
    if {$numcommits < 100} {
	set ncmupdate [expr {$numcommits + 1}]
    } elseif {$numcommits < 10000} {
	set ncmupdate [expr {$numcommits + 10}]
    } else {
	set ncmupdate [expr {$numcommits + 100}]
    }
    foreach v [array names commfd] {
	set fd $commfd($v)
	fileevent $fd readable [list getcommitlines $fd $v]
    }
}

proc readcommit {id} {
    if {[catch {set contents [exec git-cat-file commit $id]}]} return
    parsecommit $id $contents 0
}

proc updatecommits {} {
    global viewdata curview phase displayorder
    global children commitrow selectedline thickerline

    if {$phase ne {}} {
	stop_rev_list
	set phase {}
    }
    set n $curview
    foreach id $displayorder {
	catch {unset children($n,$id)}
	catch {unset commitrow($n,$id)}
    }
    set curview -1
    catch {unset selectedline}
    catch {unset thickerline}
    catch {unset viewdata($n)}
    readrefs
    showview $n
}

proc parsecommit {id contents listed} {
    global commitinfo cdate

    set inhdr 1
    set comment {}
    set headline {}
    set auname {}
    set audate {}
    set comname {}
    set comdate {}
    set hdrend [string first "\n\n" $contents]
    if {$hdrend < 0} {
	# should never happen...
	set hdrend [string length $contents]
    }
    set header [string range $contents 0 [expr {$hdrend - 1}]]
    set comment [string range $contents [expr {$hdrend + 2}] end]
    foreach line [split $header "\n"] {
	set tag [lindex $line 0]
	if {$tag == "author"} {
	    set audate [lindex $line end-1]
	    set auname [lrange $line 1 end-2]
	} elseif {$tag == "committer"} {
	    set comdate [lindex $line end-1]
	    set comname [lrange $line 1 end-2]
	}
    }
    set headline {}
    # take the first line of the comment as the headline
    set i [string first "\n" $comment]
    if {$i >= 0} {
	set headline [string trim [string range $comment 0 $i]]
    } else {
	set headline $comment
    }
    if {!$listed} {
	# git-rev-list indents the comment by 4 spaces;
	# if we got this via git-cat-file, add the indentation
	set newcomment {}
	foreach line [split $comment "\n"] {
	    append newcomment "    "
	    append newcomment $line
	    append newcomment "\n"
	}
	set comment $newcomment
    }
    if {$comdate != {}} {
	set cdate($id) $comdate
    }
    set commitinfo($id) [list $headline $auname $audate \
			     $comname $comdate $comment]
}

proc getcommit {id} {
    global commitdata commitinfo

    if {[info exists commitdata($id)]} {
	parsecommit $id $commitdata($id) 1
    } else {
	readcommit $id
	if {![info exists commitinfo($id)]} {
	    set commitinfo($id) {"No commit information available"}
	}
    }
    return 1
}

proc readrefs {} {
    global tagids idtags headids idheads tagcontents
    global otherrefids idotherrefs

    foreach v {tagids idtags headids idheads otherrefids idotherrefs} {
	catch {unset $v}
    }
    set refd [open [list | git ls-remote [gitdir]] r]
    while {0 <= [set n [gets $refd line]]} {
	if {![regexp {^([0-9a-f]{40})	refs/([^^]*)$} $line \
	    match id path]} {
	    continue
	}
	if {[regexp {^remotes/.*/HEAD$} $path match]} {
	    continue
	}
	if {![regexp {^(tags|heads)/(.*)$} $path match type name]} {
	    set type others
	    set name $path
	}
	if {[regexp {^remotes/} $path match]} {
	    set type heads
	}
	if {$type == "tags"} {
	    set tagids($name) $id
	    lappend idtags($id) $name
	    set obj {}
	    set type {}
	    set tag {}
	    catch {
		set commit [exec git-rev-parse "$id^0"]
		if {"$commit" != "$id"} {
		    set tagids($name) $commit
		    lappend idtags($commit) $name
		}
	    }		
	    catch {
	        set tagcontents($name) [exec git-cat-file tag "$id"]
	    }
	} elseif { $type == "heads" } {
	    set headids($name) $id
	    lappend idheads($id) $name
	} else {
	    set otherrefids($name) $id
	    lappend idotherrefs($id) $name
	}
    }
    close $refd
}

proc show_error {w msg} {
    message $w.m -text $msg -justify center -aspect 400
    pack $w.m -side top -fill x -padx 20 -pady 20
    button $w.ok -text OK -command "destroy $w"
    pack $w.ok -side bottom -fill x
    bind $w <Visibility> "grab $w; focus $w"
    bind $w <Key-Return> "destroy $w"
    tkwait window $w
}

proc error_popup msg {
    set w .error
    toplevel $w
    wm transient $w .
    show_error $w $msg
}

proc makewindow {} {
    global canv canv2 canv3 linespc charspc ctext cflist
    global textfont mainfont uifont
    global findtype findtypemenu findloc findstring fstring geometry
    global entries sha1entry sha1string sha1but
    global maincursor textcursor curtextcursor
    global rowctxmenu mergemax
    global highlight_files highlight_names

    menu .bar
    .bar add cascade -label "File" -menu .bar.file
    .bar configure -font $uifont
    menu .bar.file
    .bar.file add command -label "Update" -command updatecommits
    .bar.file add command -label "Reread references" -command rereadrefs
    .bar.file add command -label "Quit" -command doquit
    .bar.file configure -font $uifont
    menu .bar.edit
    .bar add cascade -label "Edit" -menu .bar.edit
    .bar.edit add command -label "Preferences" -command doprefs
    .bar.edit configure -font $uifont

    menu .bar.view -font $uifont
    .bar add cascade -label "View" -menu .bar.view
    .bar.view add command -label "New view..." -command {newview 0}
    .bar.view add command -label "Edit view..." -command editview \
	-state disabled
    .bar.view add command -label "Delete view" -command delview -state disabled
    .bar.view add separator
    .bar.view add radiobutton -label "All files" -command {showview 0} \
	-variable selectedview -value 0
    
    menu .bar.help
    .bar add cascade -label "Help" -menu .bar.help
    .bar.help add command -label "About gitk" -command about
    .bar.help add command -label "Key bindings" -command keys
    .bar.help configure -font $uifont
    . configure -menu .bar

    if {![info exists geometry(canv1)]} {
	set geometry(canv1) [expr {45 * $charspc}]
	set geometry(canv2) [expr {30 * $charspc}]
	set geometry(canv3) [expr {15 * $charspc}]
	set geometry(canvh) [expr {25 * $linespc + 4}]
	set geometry(ctextw) 80
	set geometry(ctexth) 30
	set geometry(cflistw) 30
    }
    panedwindow .ctop -orient vertical
    if {[info exists geometry(width)]} {
	.ctop conf -width $geometry(width) -height $geometry(height)
	set texth [expr {$geometry(height) - $geometry(canvh) - 56}]
	set geometry(ctexth) [expr {($texth - 8) /
				    [font metrics $textfont -linespace]}]
    }
    frame .ctop.top
    frame .ctop.top.bar
    frame .ctop.top.lbar
    pack .ctop.top.lbar -side bottom -fill x
    pack .ctop.top.bar -side bottom -fill x
    set cscroll .ctop.top.csb
    scrollbar $cscroll -command {allcanvs yview} -highlightthickness 0
    pack $cscroll -side right -fill y
    panedwindow .ctop.top.clist -orient horizontal -sashpad 0 -handlesize 4
    pack .ctop.top.clist -side top -fill both -expand 1
    .ctop add .ctop.top
    set canv .ctop.top.clist.canv
    canvas $canv -height $geometry(canvh) -width $geometry(canv1) \
	-bg white -bd 0 \
	-yscrollincr $linespc -yscrollcommand "scrollcanv $cscroll"
    .ctop.top.clist add $canv
    set canv2 .ctop.top.clist.canv2
    canvas $canv2 -height $geometry(canvh) -width $geometry(canv2) \
	-bg white -bd 0 -yscrollincr $linespc
    .ctop.top.clist add $canv2
    set canv3 .ctop.top.clist.canv3
    canvas $canv3 -height $geometry(canvh) -width $geometry(canv3) \
	-bg white -bd 0 -yscrollincr $linespc
    .ctop.top.clist add $canv3
    bind .ctop.top.clist <Configure> {resizeclistpanes %W %w}

    set sha1entry .ctop.top.bar.sha1
    set entries $sha1entry
    set sha1but .ctop.top.bar.sha1label
    button $sha1but -text "SHA1 ID: " -state disabled -relief flat \
	-command gotocommit -width 8 -font $uifont
    $sha1but conf -disabledforeground [$sha1but cget -foreground]
    pack .ctop.top.bar.sha1label -side left
    entry $sha1entry -width 40 -font $textfont -textvariable sha1string
    trace add variable sha1string write sha1change
    pack $sha1entry -side left -pady 2

    image create bitmap bm-left -data {
	#define left_width 16
	#define left_height 16
	static unsigned char left_bits[] = {
	0x00, 0x00, 0xc0, 0x01, 0xe0, 0x00, 0x70, 0x00, 0x38, 0x00, 0x1c, 0x00,
	0x0e, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x0e, 0x00, 0x1c, 0x00,
	0x38, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xc0, 0x01};
    }
    image create bitmap bm-right -data {
	#define right_width 16
	#define right_height 16
	static unsigned char right_bits[] = {
	0x00, 0x00, 0xc0, 0x01, 0x80, 0x03, 0x00, 0x07, 0x00, 0x0e, 0x00, 0x1c,
	0x00, 0x38, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x38, 0x00, 0x1c,
	0x00, 0x0e, 0x00, 0x07, 0x80, 0x03, 0xc0, 0x01};
    }
    button .ctop.top.bar.leftbut -image bm-left -command goback \
	-state disabled -width 26
    pack .ctop.top.bar.leftbut -side left -fill y
    button .ctop.top.bar.rightbut -image bm-right -command goforw \
	-state disabled -width 26
    pack .ctop.top.bar.rightbut -side left -fill y

    button .ctop.top.bar.findbut -text "Find" -command dofind -font $uifont
    pack .ctop.top.bar.findbut -side left
    set findstring {}
    set fstring .ctop.top.bar.findstring
    lappend entries $fstring
    entry $fstring -width 30 -font $textfont -textvariable findstring
    pack $fstring -side left -expand 1 -fill x
    set findtype Exact
    set findtypemenu [tk_optionMenu .ctop.top.bar.findtype \
			  findtype Exact IgnCase Regexp]
    .ctop.top.bar.findtype configure -font $uifont
    .ctop.top.bar.findtype.menu configure -font $uifont
    set findloc "All fields"
    tk_optionMenu .ctop.top.bar.findloc findloc "All fields" Headline \
	Comments Author Committer Files Pickaxe
    .ctop.top.bar.findloc configure -font $uifont
    .ctop.top.bar.findloc.menu configure -font $uifont

    pack .ctop.top.bar.findloc -side right
    pack .ctop.top.bar.findtype -side right
    # for making sure type==Exact whenever loc==Pickaxe
    trace add variable findloc write findlocchange

    label .ctop.top.lbar.flabel -text "Highlight:  Commits touching paths:" \
	-font $uifont
    pack .ctop.top.lbar.flabel -side left -fill y
    entry .ctop.top.lbar.fent -width 25 -font $textfont \
	-textvariable highlight_files
    trace add variable highlight_files write hfiles_change
    lappend entries .ctop.top.lbar.fent
    pack .ctop.top.lbar.fent -side left -fill x -expand 1
    label .ctop.top.lbar.vlabel -text " OR in view" -font $uifont
    pack .ctop.top.lbar.vlabel -side left -fill y
    global viewhlmenu selectedhlview
    set viewhlmenu [tk_optionMenu .ctop.top.lbar.vhl selectedhlview None]
    $viewhlmenu entryconf 0 -command delvhighlight
    $viewhlmenu conf -font $uifont
    .ctop.top.lbar.vhl conf -font $uifont
    pack .ctop.top.lbar.vhl -side left -fill y
    label .ctop.top.lbar.alabel -text " OR author/committer:" \
	-font $uifont
    pack .ctop.top.lbar.alabel -side left -fill y
    entry .ctop.top.lbar.aent -width 20 -font $textfont \
	-textvariable highlight_names
    trace add variable highlight_names write hnames_change
    lappend entries .ctop.top.lbar.aent
    pack .ctop.top.lbar.aent -side right -fill x -expand 1

    panedwindow .ctop.cdet -orient horizontal
    .ctop add .ctop.cdet
    frame .ctop.cdet.left
    set ctext .ctop.cdet.left.ctext
    text $ctext -bg white -state disabled -font $textfont \
	-width $geometry(ctextw) -height $geometry(ctexth) \
	-yscrollcommand {.ctop.cdet.left.sb set} -wrap none
    scrollbar .ctop.cdet.left.sb -command "$ctext yview"
    pack .ctop.cdet.left.sb -side right -fill y
    pack $ctext -side left -fill both -expand 1
    .ctop.cdet add .ctop.cdet.left

    $ctext tag conf filesep -font [concat $textfont bold] -back "#aaaaaa"
    $ctext tag conf hunksep -fore blue
    $ctext tag conf d0 -fore red
    $ctext tag conf d1 -fore "#00a000"
    $ctext tag conf m0 -fore red
    $ctext tag conf m1 -fore blue
    $ctext tag conf m2 -fore green
    $ctext tag conf m3 -fore purple
    $ctext tag conf m4 -fore brown
    $ctext tag conf m5 -fore "#009090"
    $ctext tag conf m6 -fore magenta
    $ctext tag conf m7 -fore "#808000"
    $ctext tag conf m8 -fore "#009000"
    $ctext tag conf m9 -fore "#ff0080"
    $ctext tag conf m10 -fore cyan
    $ctext tag conf m11 -fore "#b07070"
    $ctext tag conf m12 -fore "#70b0f0"
    $ctext tag conf m13 -fore "#70f0b0"
    $ctext tag conf m14 -fore "#f0b070"
    $ctext tag conf m15 -fore "#ff70b0"
    $ctext tag conf mmax -fore darkgrey
    set mergemax 16
    $ctext tag conf mresult -font [concat $textfont bold]
    $ctext tag conf msep -font [concat $textfont bold]
    $ctext tag conf found -back yellow

    frame .ctop.cdet.right
    frame .ctop.cdet.right.mode
    radiobutton .ctop.cdet.right.mode.patch -text "Patch" \
	-command reselectline -variable cmitmode -value "patch"
    radiobutton .ctop.cdet.right.mode.tree -text "Tree" \
	-command reselectline -variable cmitmode -value "tree"
    grid .ctop.cdet.right.mode.patch .ctop.cdet.right.mode.tree -sticky ew
    pack .ctop.cdet.right.mode -side top -fill x
    set cflist .ctop.cdet.right.cfiles
    set indent [font measure $mainfont "nn"]
    text $cflist -width $geometry(cflistw) -background white -font $mainfont \
	-tabs [list $indent [expr {2 * $indent}]] \
	-yscrollcommand ".ctop.cdet.right.sb set" \
	-cursor [. cget -cursor] \
	-spacing1 1 -spacing3 1
    scrollbar .ctop.cdet.right.sb -command "$cflist yview"
    pack .ctop.cdet.right.sb -side right -fill y
    pack $cflist -side left -fill both -expand 1
    $cflist tag configure highlight \
	-background [$cflist cget -selectbackground]
    $cflist tag configure bold -font [concat $mainfont bold]
    .ctop.cdet add .ctop.cdet.right
    bind .ctop.cdet <Configure> {resizecdetpanes %W %w}

    pack .ctop -side top -fill both -expand 1

    bindall <1> {selcanvline %W %x %y}
    #bindall <B1-Motion> {selcanvline %W %x %y}
    bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
    bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
    bindall <2> "canvscan mark %W %x %y"
    bindall <B2-Motion> "canvscan dragto %W %x %y"
    bindkey <Home> selfirstline
    bindkey <End> sellastline
    bind . <Key-Up> "selnextline -1"
    bind . <Key-Down> "selnextline 1"
    bindkey <Key-Right> "goforw"
    bindkey <Key-Left> "goback"
    bind . <Key-Prior> "selnextpage -1"
    bind . <Key-Next> "selnextpage 1"
    bind . <Control-Home> "allcanvs yview moveto 0.0"
    bind . <Control-End> "allcanvs yview moveto 1.0"
    bind . <Control-Key-Up> "allcanvs yview scroll -1 units"
    bind . <Control-Key-Down> "allcanvs yview scroll 1 units"
    bind . <Control-Key-Prior> "allcanvs yview scroll -1 pages"
    bind . <Control-Key-Next> "allcanvs yview scroll 1 pages"
    bindkey <Key-Delete> "$ctext yview scroll -1 pages"
    bindkey <Key-BackSpace> "$ctext yview scroll -1 pages"
    bindkey <Key-space> "$ctext yview scroll 1 pages"
    bindkey p "selnextline -1"
    bindkey n "selnextline 1"
    bindkey z "goback"
    bindkey x "goforw"
    bindkey i "selnextline -1"
    bindkey k "selnextline 1"
    bindkey j "goback"
    bindkey l "goforw"
    bindkey b "$ctext yview scroll -1 pages"
    bindkey d "$ctext yview scroll 18 units"
    bindkey u "$ctext yview scroll -18 units"
    bindkey / {findnext 1}
    bindkey <Key-Return> {findnext 0}
    bindkey ? findprev
    bindkey f nextfile
    bind . <Control-q> doquit
    bind . <Control-f> dofind
    bind . <Control-g> {findnext 0}
    bind . <Control-r> findprev
    bind . <Control-equal> {incrfont 1}
    bind . <Control-KP_Add> {incrfont 1}
    bind . <Control-minus> {incrfont -1}
    bind . <Control-KP_Subtract> {incrfont -1}
    bind . <Destroy> {savestuff %W}
    bind . <Button-1> "click %W"
    bind $fstring <Key-Return> dofind
    bind $sha1entry <Key-Return> gotocommit
    bind $sha1entry <<PasteSelection>> clearsha1
    bind $cflist <1> {sel_flist %W %x %y; break}
    bind $cflist <B1-Motion> {sel_flist %W %x %y; break}
    bind $cflist <ButtonRelease-1> {treeclick %W %x %y}

    set maincursor [. cget -cursor]
    set textcursor [$ctext cget -cursor]
    set curtextcursor $textcursor

    set rowctxmenu .rowctxmenu
    menu $rowctxmenu -tearoff 0
    $rowctxmenu add command -label "Diff this -> selected" \
	-command {diffvssel 0}
    $rowctxmenu add command -label "Diff selected -> this" \
	-command {diffvssel 1}
    $rowctxmenu add command -label "Make patch" -command mkpatch
    $rowctxmenu add command -label "Create tag" -command mktag
    $rowctxmenu add command -label "Write commit to file" -command writecommit
}

# mouse-2 makes all windows scan vertically, but only the one
# the cursor is in scans horizontally
proc canvscan {op w x y} {
    global canv canv2 canv3
    foreach c [list $canv $canv2 $canv3] {
	if {$c == $w} {
	    $c scan $op $x $y
	} else {
	    $c scan $op 0 $y
	}
    }
}

proc scrollcanv {cscroll f0 f1} {
    $cscroll set $f0 $f1
    drawfrac $f0 $f1
    flushhighlights
}

# when we make a key binding for the toplevel, make sure
# it doesn't get triggered when that key is pressed in the
# find string entry widget.
proc bindkey {ev script} {
    global entries
    bind . $ev $script
    set escript [bind Entry $ev]
    if {$escript == {}} {
	set escript [bind Entry <Key>]
    }
    foreach e $entries {
	bind $e $ev "$escript; break"
    }
}

# set the focus back to the toplevel for any click outside
# the entry widgets
proc click {w} {
    global entries
    foreach e $entries {
	if {$w == $e} return
    }
    focus .
}

proc savestuff {w} {
    global canv canv2 canv3 ctext cflist mainfont textfont uifont
    global stuffsaved findmergefiles maxgraphpct
    global maxwidth
    global viewname viewfiles viewargs viewperm nextviewnum
    global cmitmode

    if {$stuffsaved} return
    if {![winfo viewable .]} return
    catch {
	set f [open "~/.gitk-new" w]
	puts $f [list set mainfont $mainfont]
	puts $f [list set textfont $textfont]
	puts $f [list set uifont $uifont]
	puts $f [list set findmergefiles $findmergefiles]
	puts $f [list set maxgraphpct $maxgraphpct]
	puts $f [list set maxwidth $maxwidth]
	puts $f [list set cmitmode $cmitmode]
	puts $f "set geometry(width) [winfo width .ctop]"
	puts $f "set geometry(height) [winfo height .ctop]"
	puts $f "set geometry(canv1) [expr {[winfo width $canv]-2}]"
	puts $f "set geometry(canv2) [expr {[winfo width $canv2]-2}]"
	puts $f "set geometry(canv3) [expr {[winfo width $canv3]-2}]"
	puts $f "set geometry(canvh) [expr {[winfo height $canv]-2}]"
	set wid [expr {([winfo width $ctext] - 8) \
			   / [font measure $textfont "0"]}]
	puts $f "set geometry(ctextw) $wid"
	set wid [expr {([winfo width $cflist] - 11) \
			   / [font measure [$cflist cget -font] "0"]}]
	puts $f "set geometry(cflistw) $wid"
	puts -nonewline $f "set permviews {"
	for {set v 0} {$v < $nextviewnum} {incr v} {
	    if {$viewperm($v)} {
		puts $f "{[list $viewname($v) $viewfiles($v) $viewargs($v)]}"
	    }
	}
	puts $f "}"
	close $f
	file rename -force "~/.gitk-new" "~/.gitk"
    }
    set stuffsaved 1
}

proc resizeclistpanes {win w} {
    global oldwidth
    if {[info exists oldwidth($win)]} {
	set s0 [$win sash coord 0]
	set s1 [$win sash coord 1]
	if {$w < 60} {
	    set sash0 [expr {int($w/2 - 2)}]
	    set sash1 [expr {int($w*5/6 - 2)}]
	} else {
	    set factor [expr {1.0 * $w / $oldwidth($win)}]
	    set sash0 [expr {int($factor * [lindex $s0 0])}]
	    set sash1 [expr {int($factor * [lindex $s1 0])}]
	    if {$sash0 < 30} {
		set sash0 30
	    }
	    if {$sash1 < $sash0 + 20} {
		set sash1 [expr {$sash0 + 20}]
	    }
	    if {$sash1 > $w - 10} {
		set sash1 [expr {$w - 10}]
		if {$sash0 > $sash1 - 20} {
		    set sash0 [expr {$sash1 - 20}]
		}
	    }
	}
	$win sash place 0 $sash0 [lindex $s0 1]
	$win sash place 1 $sash1 [lindex $s1 1]
    }
    set oldwidth($win) $w
}

proc resizecdetpanes {win w} {
    global oldwidth
    if {[info exists oldwidth($win)]} {
	set s0 [$win sash coord 0]
	if {$w < 60} {
	    set sash0 [expr {int($w*3/4 - 2)}]
	} else {
	    set factor [expr {1.0 * $w / $oldwidth($win)}]
	    set sash0 [expr {int($factor * [lindex $s0 0])}]
	    if {$sash0 < 45} {
		set sash0 45
	    }
	    if {$sash0 > $w - 15} {
		set sash0 [expr {$w - 15}]
	    }
	}
	$win sash place 0 $sash0 [lindex $s0 1]
    }
    set oldwidth($win) $w
}

proc allcanvs args {
    global canv canv2 canv3
    eval $canv $args
    eval $canv2 $args
    eval $canv3 $args
}

proc bindall {event action} {
    global canv canv2 canv3
    bind $canv $event $action
    bind $canv2 $event $action
    bind $canv3 $event $action
}

proc about {} {
    set w .about
    if {[winfo exists $w]} {
	raise $w
	return
    }
    toplevel $w
    wm title $w "About gitk"
    message $w.m -text {
Gitk - a commit viewer for git

Copyright � 2005-2006 Paul Mackerras

Use and redistribute under the terms of the GNU General Public License} \
	    -justify center -aspect 400
    pack $w.m -side top -fill x -padx 20 -pady 20
    button $w.ok -text Close -command "destroy $w"
    pack $w.ok -side bottom
}

proc keys {} {
    set w .keys
    if {[winfo exists $w]} {
	raise $w
	return
    }
    toplevel $w
    wm title $w "Gitk key bindings"
    message $w.m -text {
Gitk key bindings:

<Ctrl-Q>		Quit
<Home>		Move to first commit
<End>		Move to last commit
<Up>, p, i	Move up one commit
<Down>, n, k	Move down one commit
<Left>, z, j	Go back in history list
<Right>, x, l	Go forward in history list
<PageUp>	Move up one page in commit list
<PageDown>	Move down one page in commit list
<Ctrl-Home>	Scroll to top of commit list
<Ctrl-End>	Scroll to bottom of commit list
<Ctrl-Up>	Scroll commit list up one line
<Ctrl-Down>	Scroll commit list down one line
<Ctrl-PageUp>	Scroll commit list up one page
<Ctrl-PageDown>	Scroll commit list down one page
<Delete>, b	Scroll diff view up one page
<Backspace>	Scroll diff view up one page
<Space>		Scroll diff view down one page
u		Scroll diff view up 18 lines
d		Scroll diff view down 18 lines
<Ctrl-F>		Find
<Ctrl-G>		Move to next find hit
<Ctrl-R>		Move to previous find hit
<Return>	Move to next find hit
/		Move to next find hit, or redo find
?		Move to previous find hit
f		Scroll diff view to next file
<Ctrl-KP+>	Increase font size
<Ctrl-plus>	Increase font size
<Ctrl-KP->	Decrease font size
<Ctrl-minus>	Decrease font size
} \
	    -justify left -bg white -border 2 -relief sunken
    pack $w.m -side top -fill both
    button $w.ok -text Close -command "destroy $w"
    pack $w.ok -side bottom
}

# Procedures for manipulating the file list window at the
# bottom right of the overall window.

proc treeview {w l openlevs} {
    global treecontents treediropen treeheight treeparent treeindex

    set ix 0
    set treeindex() 0
    set lev 0
    set prefix {}
    set prefixend -1
    set prefendstack {}
    set htstack {}
    set ht 0
    set treecontents() {}
    $w conf -state normal
    foreach f $l {
	while {[string range $f 0 $prefixend] ne $prefix} {
	    if {$lev <= $openlevs} {
		$w mark set e:$treeindex($prefix) "end -1c"
		$w mark gravity e:$treeindex($prefix) left
	    }
	    set treeheight($prefix) $ht
	    incr ht [lindex $htstack end]
	    set htstack [lreplace $htstack end end]
	    set prefixend [lindex $prefendstack end]
	    set prefendstack [lreplace $prefendstack end end]
	    set prefix [string range $prefix 0 $prefixend]
	    incr lev -1
	}
	set tail [string range $f [expr {$prefixend+1}] end]
	while {[set slash [string first "/" $tail]] >= 0} {
	    lappend htstack $ht
	    set ht 0
	    lappend prefendstack $prefixend
	    incr prefixend [expr {$slash + 1}]
	    set d [string range $tail 0 $slash]
	    lappend treecontents($prefix) $d
	    set oldprefix $prefix
	    append prefix $d
	    set treecontents($prefix) {}
	    set treeindex($prefix) [incr ix]
	    set treeparent($prefix) $oldprefix
	    set tail [string range $tail [expr {$slash+1}] end]
	    if {$lev <= $openlevs} {
		set ht 1
		set treediropen($prefix) [expr {$lev < $openlevs}]
		set bm [expr {$lev == $openlevs? "tri-rt": "tri-dn"}]
		$w mark set d:$ix "end -1c"
		$w mark gravity d:$ix left
		set str "\n"
		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
		$w insert end $str
		$w image create end -align center -image $bm -padx 1 \
		    -name a:$ix
		$w insert end $d [highlight_tag $prefix]
		$w mark set s:$ix "end -1c"
		$w mark gravity s:$ix left
	    }
	    incr lev
	}
	if {$tail ne {}} {
	    if {$lev <= $openlevs} {
		incr ht
		set str "\n"
		for {set i 0} {$i < $lev} {incr i} {append str "\t"}
		$w insert end $str
		$w insert end $tail [highlight_tag $f]
	    }
	    lappend treecontents($prefix) $tail
	}
    }
    while {$htstack ne {}} {
	set treeheight($prefix) $ht
	incr ht [lindex $htstack end]
	set htstack [lreplace $htstack end end]
    }
    $w conf -state disabled
}

proc linetoelt {l} {
    global treeheight treecontents

    set y 2
    set prefix {}
    while {1} {
	foreach e $treecontents($prefix) {
	    if {$y == $l} {
		return "$prefix$e"
	    }
	    set n 1
	    if {[string index $e end] eq "/"} {
		set n $treeheight($prefix$e)
		if {$y + $n > $l} {
		    append prefix $e
		    incr y
		    break
		}
	    }
	    incr y $n
	}
    }
}

proc highlight_tree {y prefix} {
    global treeheight treecontents cflist

    foreach e $treecontents($prefix) {
	set path $prefix$e
	if {[highlight_tag $path] ne {}} {
	    $cflist tag add bold $y.0 "$y.0 lineend"
	}
	incr y
	if {[string index $e end] eq "/" && $treeheight($path) > 1} {
	    set y [highlight_tree $y $path]
	}
    }
    return $y
}

proc treeclosedir {w dir} {
    global treediropen treeheight treeparent treeindex

    set ix $treeindex($dir)
    $w conf -state normal
    $w delete s:$ix e:$ix
    set treediropen($dir) 0
    $w image configure a:$ix -image tri-rt
    $w conf -state disabled
    set n [expr {1 - $treeheight($dir)}]
    while {$dir ne {}} {
	incr treeheight($dir) $n
	set dir $treeparent($dir)
    }
}

proc treeopendir {w dir} {
    global treediropen treeheight treeparent treecontents treeindex

    set ix $treeindex($dir)
    $w conf -state normal
    $w image configure a:$ix -image tri-dn
    $w mark set e:$ix s:$ix
    $w mark gravity e:$ix right
    set lev 0
    set str "\n"
    set n [llength $treecontents($dir)]
    for {set x $dir} {$x ne {}} {set x $treeparent($x)} {
	incr lev
	append str "\t"
	incr treeheight($x) $n
    }
    foreach e $treecontents($dir) {
	set de $dir$e
	if {[string index $e end] eq "/"} {
	    set iy $treeindex($de)
	    $w mark set d:$iy e:$ix
	    $w mark gravity d:$iy left
	    $w insert e:$ix $str
	    set treediropen($de) 0
	    $w image create e:$ix -align center -image tri-rt -padx 1 \
		-name a:$iy
	    $w insert e:$ix $e [highlight_tag $de]
	    $w mark set s:$iy e:$ix
	    $w mark gravity s:$iy left
	    set treeheight($de) 1
	} else {
	    $w insert e:$ix $str
	    $w insert e:$ix $e [highlight_tag $de]
	}
    }
    $w mark gravity e:$ix left
    $w conf -state disabled
    set treediropen($dir) 1
    set top [lindex [split [$w index @0,0] .] 0]
    set ht [$w cget -height]
    set l [lindex [split [$w index s:$ix] .] 0]
    if {$l < $top} {
	$w yview $l.0
    } elseif {$l + $n + 1 > $top + $ht} {
	set top [expr {$l + $n + 2 - $ht}]
	if {$l < $top} {
	    set top $l
	}
	$w yview $top.0
    }
}

proc treeclick {w x y} {
    global treediropen cmitmode ctext cflist cflist_top

    if {$cmitmode ne "tree"} return
    if {![info exists cflist_top]} return
    set l [lindex [split [$w index "@$x,$y"] "."] 0]
    $cflist tag remove highlight $cflist_top.0 "$cflist_top.0 lineend"
    $cflist tag add highlight $l.0 "$l.0 lineend"
    set cflist_top $l
    if {$l == 1} {
	$ctext yview 1.0
	return
    }
    set e [linetoelt $l]
    if {[string index $e end] ne "/"} {
	showfile $e
    } elseif {$treediropen($e)} {
	treeclosedir $w $e
    } else {
	treeopendir $w $e
    }
}

proc setfilelist {id} {
    global treefilelist cflist

    treeview $cflist $treefilelist($id) 0
}

image create bitmap tri-rt -background black -foreground blue -data {
    #define tri-rt_width 13
    #define tri-rt_height 13
    static unsigned char tri-rt_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x30, 0x00, 0x70, 0x00, 0xf0, 0x00,
       0xf0, 0x01, 0xf0, 0x00, 0x70, 0x00, 0x30, 0x00, 0x10, 0x00, 0x00, 0x00,
       0x00, 0x00};
} -maskdata {
    #define tri-rt-mask_width 13
    #define tri-rt-mask_height 13
    static unsigned char tri-rt-mask_bits[] = {
       0x08, 0x00, 0x18, 0x00, 0x38, 0x00, 0x78, 0x00, 0xf8, 0x00, 0xf8, 0x01,
       0xf8, 0x03, 0xf8, 0x01, 0xf8, 0x00, 0x78, 0x00, 0x38, 0x00, 0x18, 0x00,
       0x08, 0x00};
}
image create bitmap tri-dn -background black -foreground blue -data {
    #define tri-dn_width 13
    #define tri-dn_height 13
    static unsigned char tri-dn_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x07, 0xf8, 0x03,
       0xf0, 0x01, 0xe0, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00};
} -maskdata {
    #define tri-dn-mask_width 13
    #define tri-dn-mask_height 13
    static unsigned char tri-dn-mask_bits[] = {
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x1f, 0xfe, 0x0f, 0xfc, 0x07,
       0xf8, 0x03, 0xf0, 0x01, 0xe0, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00};
}

proc init_flist {first} {
    global cflist cflist_top selectedline difffilestart

    $cflist conf -state normal
    $cflist delete 0.0 end
    if {$first ne {}} {
	$cflist insert end $first
	set cflist_top 1
	$cflist tag add highlight 1.0 "1.0 lineend"
    } else {
	catch {unset cflist_top}
    }
    $cflist conf -state disabled
    set difffilestart {}
}

proc highlight_tag {f} {
    global highlight_paths

    foreach p $highlight_paths {
	if {[string match $p $f]} {
	    return "bold"
	}
    }
    return {}
}

proc highlight_filelist {} {
    global cmitmode cflist

    $cflist conf -state normal
    if {$cmitmode ne "tree"} {
	set end [lindex [split [$cflist index end] .] 0]
	for {set l 2} {$l < $end} {incr l} {
	    set line [$cflist get $l.0 "$l.0 lineend"]
	    if {[highlight_tag $line] ne {}} {
		$cflist tag add bold $l.0 "$l.0 lineend"
	    }
	}
    } else {
	highlight_tree 2 {}
    }
    $cflist conf -state disabled
}

proc unhighlight_filelist {} {
    global cflist

    $cflist conf -state normal
    $cflist tag remove bold 1.0 end
    $cflist conf -state disabled
}

proc add_flist {fl} {
    global cflist

    $cflist conf -state normal
    foreach f $fl {
	$cflist insert end "\n"
	$cflist insert end $f [highlight_tag $f]
    }
    $cflist conf -state disabled
}

proc sel_flist {w x y} {
    global ctext difffilestart cflist cflist_top cmitmode

    if {$cmitmode eq "tree"} return
    if {![info exists cflist_top]} return
    set l [lindex [split [$w index "@$x,$y"] "."] 0]
    $cflist tag remove highlight $cflist_top.0 "$cflist_top.0 lineend"
    $cflist tag add highlight $l.0 "$l.0 lineend"
    set cflist_top $l
    if {$l == 1} {
	$ctext yview 1.0
    } else {
	catch {$ctext yview [lindex $difffilestart [expr {$l - 2}]]}
    }
}

# Functions for adding and removing shell-type quoting

proc shellquote {str} {
    if {![string match "*\['\"\\ \t]*" $str]} {
	return $str
    }
    if {![string match "*\['\"\\]*" $str]} {
	return "\"$str\""
    }
    if {![string match "*'*" $str]} {
	return "'$str'"
    }
    return "\"[string map {\" \\\" \\ \\\\} $str]\""
}

proc shellarglist {l} {
    set str {}
    foreach a $l {
	if {$str ne {}} {
	    append str " "
	}
	append str [shellquote $a]
    }
    return $str
}

proc shelldequote {str} {
    set ret {}
    set used -1
    while {1} {
	incr used
	if {![regexp -start $used -indices "\['\"\\\\ \t]" $str first]} {
	    append ret [string range $str $used end]
	    set used [string length $str]
	    break
	}
	set first [lindex $first 0]
	set ch [string index $str $first]
	if {$first > $used} {
	    append ret [string range $str $used [expr {$first - 1}]]
	    set used $first
	}
	if {$ch eq " " || $ch eq "\t"} break
	incr used
	if {$ch eq "'"} {
	    set first [string first "'" $str $used]
	    if {$first < 0} {
		error "unmatched single-quote"
	    }
	    append ret [string range $str $used [expr {$first - 1}]]
	    set used $first
	    continue
	}
	if {$ch eq "\\"} {
	    if {$used >= [string length $str]} {
		error "trailing backslash"
	    }
	    append ret [string index $str $used]
	    continue
	}
	# here ch == "\""
	while {1} {
	    if {![regexp -start $used -indices "\[\"\\\\]" $str first]} {
		error "unmatched double-quote"
	    }
	    set first [lindex $first 0]
	    set ch [string index $str $first]
	    if {$first > $used} {
		append ret [string range $str $used [expr {$first - 1}]]
		set used $first
	    }
	    if {$ch eq "\""} break
	    incr used
	    append ret [string index $str $used]
	    incr used
	}
    }
    return [list $used $ret]
}

proc shellsplit {str} {
    set l {}
    while {1} {
	set str [string trimleft $str]
	if {$str eq {}} break
	set dq [shelldequote $str]
	set n [lindex $dq 0]
	set word [lindex $dq 1]
	set str [string range $str $n end]
	lappend l $word
    }
    return $l
}

# Code to implement multiple views

proc newview {ishighlight} {
    global nextviewnum newviewname newviewperm uifont newishighlight
    global newviewargs revtreeargs

    set newishighlight $ishighlight
    set top .gitkview
    if {[winfo exists $top]} {
	raise $top
	return
    }
    set newviewname($nextviewnum) "View $nextviewnum"
    set newviewperm($nextviewnum) 0
    set newviewargs($nextviewnum) [shellarglist $revtreeargs]
    vieweditor $top $nextviewnum "Gitk view definition" 
}

proc editview {} {
    global curview
    global viewname viewperm newviewname newviewperm
    global viewargs newviewargs

    set top .gitkvedit-$curview
    if {[winfo exists $top]} {
	raise $top
	return
    }
    set newviewname($curview) $viewname($curview)
    set newviewperm($curview) $viewperm($curview)
    set newviewargs($curview) [shellarglist $viewargs($curview)]
    vieweditor $top $curview "Gitk: edit view $viewname($curview)"
}

proc vieweditor {top n title} {
    global newviewname newviewperm viewfiles
    global uifont

    toplevel $top
    wm title $top $title
    label $top.nl -text "Name" -font $uifont
    entry $top.name -width 20 -textvariable newviewname($n)
    grid $top.nl $top.name -sticky w -pady 5
    checkbutton $top.perm -text "Remember this view" -variable newviewperm($n)
    grid $top.perm - -pady 5 -sticky w
    message $top.al -aspect 1000 -font $uifont \
	-text "Commits to include (arguments to git-rev-list):"
    grid $top.al - -sticky w -pady 5
    entry $top.args -width 50 -textvariable newviewargs($n) \
	-background white
    grid $top.args - -sticky ew -padx 5
    message $top.l -aspect 1000 -font $uifont \
	-text "Enter files and directories to include, one per line:"
    grid $top.l - -sticky w
    text $top.t -width 40 -height 10 -background white
    if {[info exists viewfiles($n)]} {
	foreach f $viewfiles($n) {
	    $top.t insert end $f
	    $top.t insert end "\n"
	}
	$top.t delete {end - 1c} end
	$top.t mark set insert 0.0
    }
    grid $top.t - -sticky ew -padx 5
    frame $top.buts
    button $top.buts.ok -text "OK" -command [list newviewok $top $n]
    button $top.buts.can -text "Cancel" -command [list destroy $top]
    grid $top.buts.ok $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - -pady 10 -sticky ew
    focus $top.t
}

proc doviewmenu {m first cmd op argv} {
    set nmenu [$m index end]
    for {set i $first} {$i <= $nmenu} {incr i} {
	if {[$m entrycget $i -command] eq $cmd} {
	    eval $m $op $i $argv
	    break
	}
    }
}

proc allviewmenus {n op args} {
    global viewhlmenu

    doviewmenu .bar.view 7 [list showview $n] $op $args
    doviewmenu $viewhlmenu 1 [list addvhighlight $n] $op $args
}

proc newviewok {top n} {
    global nextviewnum newviewperm newviewname newishighlight
    global viewname viewfiles viewperm selectedview curview
    global viewargs newviewargs viewhlmenu

    if {[catch {
	set newargs [shellsplit $newviewargs($n)]
    } err]} {
	error_popup "Error in commit selection arguments: $err"
	wm raise $top
	focus $top
	return
    }
    set files {}
    foreach f [split [$top.t get 0.0 end] "\n"] {
	set ft [string trim $f]
	if {$ft ne {}} {
	    lappend files $ft
	}
    }
    if {![info exists viewfiles($n)]} {
	# creating a new view
	incr nextviewnum
	set viewname($n) $newviewname($n)
	set viewperm($n) $newviewperm($n)
	set viewfiles($n) $files
	set viewargs($n) $newargs
	addviewmenu $n
	if {!$newishighlight} {
	    after idle showview $n
	} else {
	    after idle addvhighlight $n
	}
    } else {
	# editing an existing view
	set viewperm($n) $newviewperm($n)
	if {$newviewname($n) ne $viewname($n)} {
	    set viewname($n) $newviewname($n)
	    doviewmenu .bar.view 7 [list showview $n] \
		entryconf [list -label $viewname($n)]
	    doviewmenu $viewhlmenu 1 [list addvhighlight $n] \
		entryconf [list -label $viewname($n) -value $viewname($n)]
	}
	if {$files ne $viewfiles($n) || $newargs ne $viewargs($n)} {
	    set viewfiles($n) $files
	    set viewargs($n) $newargs
	    if {$curview == $n} {
		after idle updatecommits
	    }
	}
    }
    catch {destroy $top}
}

proc delview {} {
    global curview viewdata viewperm hlview selectedhlview

    if {$curview == 0} return
    if {[info exists hlview] && $hlview == $curview} {
	set selectedhlview None
	unset hlview
    }
    allviewmenus $curview delete
    set viewdata($curview) {}
    set viewperm($curview) 0
    showview 0
}

proc addviewmenu {n} {
    global viewname viewhlmenu

    .bar.view add radiobutton -label $viewname($n) \
	-command [list showview $n] -variable selectedview -value $n
    $viewhlmenu add radiobutton -label $viewname($n) \
	-command [list addvhighlight $n] -variable selectedhlview
}

proc flatten {var} {
    global $var

    set ret {}
    foreach i [array names $var] {
	lappend ret $i [set $var\($i\)]
    }
    return $ret
}

proc unflatten {var l} {
    global $var

    catch {unset $var}
    foreach {i v} $l {
	set $var\($i\) $v
    }
}

proc showview {n} {
    global curview viewdata viewfiles
    global displayorder parentlist childlist rowidlist rowoffsets
    global colormap rowtextx commitrow nextcolor canvxmax
    global numcommits rowrangelist commitlisted idrowranges
    global selectedline currentid canv canvy0
    global matchinglines treediffs
    global pending_select phase
    global commitidx rowlaidout rowoptim linesegends
    global commfd nextupdate
    global selectedview
    global vparentlist vchildlist vdisporder vcmitlisted
    global hlview selectedhlview

    if {$n == $curview} return
    set selid {}
    if {[info exists selectedline]} {
	set selid $currentid
	set y [yc $selectedline]
	set ymax [lindex [$canv cget -scrollregion] 3]
	set span [$canv yview]
	set ytop [expr {[lindex $span 0] * $ymax}]
	set ybot [expr {[lindex $span 1] * $ymax}]
	if {$ytop < $y && $y < $ybot} {
	    set yscreen [expr {$y - $ytop}]
	} else {
	    set yscreen [expr {($ybot - $ytop) / 2}]
	}
    }
    unselectline
    normalline
    stopfindproc
    if {$curview >= 0} {
	set vparentlist($curview) $parentlist
	set vchildlist($curview) $childlist
	set vdisporder($curview) $displayorder
	set vcmitlisted($curview) $commitlisted
	if {$phase ne {}} {
	    set viewdata($curview) \
		[list $phase $rowidlist $rowoffsets $rowrangelist \
		     [flatten idrowranges] [flatten idinlist] \
		     $rowlaidout $rowoptim $numcommits $linesegends]
	} elseif {![info exists viewdata($curview)]
		  || [lindex $viewdata($curview) 0] ne {}} {
	    set viewdata($curview) \
		[list {} $rowidlist $rowoffsets $rowrangelist]
	}
    }
    catch {unset matchinglines}
    catch {unset treediffs}
    clear_display
    if {[info exists hlview] && $hlview == $n} {
	unset hlview
	set selectedhlview None
    }

    set curview $n
    set selectedview $n
    .bar.view entryconf 2 -state [expr {$n == 0? "disabled": "normal"}]
    .bar.view entryconf 3 -state [expr {$n == 0? "disabled": "normal"}]

    if {![info exists viewdata($n)]} {
	set pending_select $selid
	getcommits
	return
    }

    set v $viewdata($n)
    set phase [lindex $v 0]
    set displayorder $vdisporder($n)
    set parentlist $vparentlist($n)
    set childlist $vchildlist($n)
    set commitlisted $vcmitlisted($n)
    set rowidlist [lindex $v 1]
    set rowoffsets [lindex $v 2]
    set rowrangelist [lindex $v 3]
    if {$phase eq {}} {
	set numcommits [llength $displayorder]
	catch {unset idrowranges}
    } else {
	unflatten idrowranges [lindex $v 4]
	unflatten idinlist [lindex $v 5]
	set rowlaidout [lindex $v 6]
	set rowoptim [lindex $v 7]
	set numcommits [lindex $v 8]
	set linesegends [lindex $v 9]
    }

    catch {unset colormap}
    catch {unset rowtextx}
    set nextcolor 0
    set canvxmax [$canv cget -width]
    set curview $n
    set row 0
    setcanvscroll
    set yf 0
    set row 0
    if {$selid ne {} && [info exists commitrow($n,$selid)]} {
	set row $commitrow($n,$selid)
	# try to get the selected row in the same position on the screen
	set ymax [lindex [$canv cget -scrollregion] 3]
	set ytop [expr {[yc $row] - $yscreen}]
	if {$ytop < 0} {
	    set ytop 0
	}
	set yf [expr {$ytop * 1.0 / $ymax}]
    }
    allcanvs yview moveto $yf
    drawvisible
    selectline $row 0
    if {$phase ne {}} {
	if {$phase eq "getcommits"} {
	    show_status "Reading commits..."
	}
	if {[info exists commfd($n)]} {
	    layoutmore
	} else {
	    finishcommits
	}
    } elseif {$numcommits == 0} {
	show_status "No commits selected"
    }
}

# Stuff relating to the highlighting facility

proc ishighlighted {row} {
    global vhighlights fhighlights nhighlights

    if {[info exists nhighlights($row)] && $nhighlights($row) > 0} {
	return $nhighlights($row)
    }
    if {[info exists vhighlights($row)] && $vhighlights($row) > 0} {
	return $vhighlights($row)
    }
    if {[info exists fhighlights($row)] && $fhighlights($row) > 0} {
	return $fhighlights($row)
    }
    return 0
}

proc bolden {row font} {
    global canv linehtag selectedline

    $canv itemconf $linehtag($row) -font $font
    if {$row == $selectedline} {
	$canv delete secsel
	set t [eval $canv create rect [$canv bbox $linehtag($row)] \
		   -outline {{}} -tags secsel \
		   -fill [$canv cget -selectbackground]]
	$canv lower $t
    }
}

proc bolden_name {row font} {
    global canv2 linentag selectedline

    $canv2 itemconf $linentag($row) -font $font
    if {$row == $selectedline} {
	$canv2 delete secsel
	set t [eval $canv2 create rect [$canv2 bbox $linentag($row)] \
		   -outline {{}} -tags secsel \
		   -fill [$canv2 cget -selectbackground]]
	$canv2 lower $t
    }
}

proc unbolden {rows} {
    global mainfont

    foreach row $rows {
	if {![ishighlighted $row]} {
	    bolden $row $mainfont
	}
    }
}

proc addvhighlight {n} {
    global hlview curview viewdata vhl_done vhighlights commitidx

    if {[info exists hlview]} {
	delvhighlight
    }
    set hlview $n
    if {$n != $curview && ![info exists viewdata($n)]} {
	set viewdata($n) [list getcommits {{}} {{}} {} {} {} 0 0 0 {}]
	set vparentlist($n) {}
	set vchildlist($n) {}
	set vdisporder($n) {}
	set vcmitlisted($n) {}
	start_rev_list $n
    }
    set vhl_done $commitidx($hlview)
    if {$vhl_done > 0} {
	drawvisible
    }
}

proc delvhighlight {} {
    global hlview vhighlights
    global selectedline

    if {![info exists hlview]} return
    unset hlview
    set rows [array names vhighlights]
    if {$rows ne {}} {
	unset vhighlights
	unbolden $rows
    }
}

proc vhighlightmore {} {
    global hlview vhl_done commitidx vhighlights
    global displayorder vdisporder curview mainfont

    set font [concat $mainfont bold]
    set max $commitidx($hlview)
    if {$hlview == $curview} {
	set disp $displayorder
    } else {
	set disp $vdisporder($hlview)
    }
    set vr [visiblerows]
    set r0 [lindex $vr 0]
    set r1 [lindex $vr 1]
    for {set i $vhl_done} {$i < $max} {incr i} {
	set id [lindex $disp $i]
	if {[info exists commitrow($curview,$id)]} {
	    set row $commitrow($curview,$id)
	    if {$r0 <= $row && $row <= $r1} {
		if {![highlighted $row]} {
		    bolden $row $font
		}
		set vhighlights($row) 1
	    }
	}
    }
    set vhl_done $max
}

proc askvhighlight {row id} {
    global hlview vhighlights commitrow iddrawn mainfont

    if {[info exists commitrow($hlview,$id)]} {
	if {[info exists iddrawn($id)] && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
	set vhighlights($row) 1
    } else {
	set vhighlights($row) 0
    }
}

proc hfiles_change {name ix op} {
    global highlight_files filehighlight fhighlights fh_serial
    global mainfont highlight_paths

    if {[info exists filehighlight]} {
	# delete previous highlights
	catch {close $filehighlight}
	unset filehighlight
	set rows [array names fhighlights]
	if {$rows ne {}} {
	    unset fhighlights
	    unbolden $rows
	}
	unhighlight_filelist
    }
    set highlight_paths {}
    after cancel do_file_hl $fh_serial
    incr fh_serial
    if {$highlight_files ne {}} {
	after 300 do_file_hl $fh_serial
    }
}

proc makepatterns {l} {
    set ret {}
    foreach e $l {
	set ee [string map {"*" "\\*" "?" "\\?" "\[" "\\\[" "\\" "\\\\"} $e]
	if {[string index $ee end] eq "/"} {
	    lappend ret "$ee*"
	} else {
	    lappend ret $ee
	    lappend ret "$ee/*"
	}
    }
    return $ret
}

proc do_file_hl {serial} {
    global highlight_files filehighlight highlight_paths

    if {[catch {set paths [shellsplit $highlight_files]}]} return
    set highlight_paths [makepatterns $paths]
    highlight_filelist
    set cmd [concat | git-diff-tree -r -s --stdin -- $paths]
    set filehighlight [open $cmd r+]
    fconfigure $filehighlight -blocking 0
    fileevent $filehighlight readable readfhighlight
    drawvisible
    flushhighlights
}

proc flushhighlights {} {
    global filehighlight

    if {[info exists filehighlight]} {
	puts $filehighlight ""
	flush $filehighlight
    }
}

proc askfilehighlight {row id} {
    global filehighlight fhighlights

    set fhighlights($row) 0
    puts $filehighlight $id
}

proc readfhighlight {} {
    global filehighlight fhighlights commitrow curview mainfont iddrawn

    set n [gets $filehighlight line]
    if {$n < 0} {
	if {[eof $filehighlight]} {
	    # strange...
	    puts "oops, git-diff-tree died"
	    catch {close $filehighlight}
	    unset filehighlight
	}
	return
    }
    set line [string trim $line]
    if {$line eq {}} return
    if {![info exists commitrow($curview,$line)]} return
    set row $commitrow($curview,$line)
    if {[info exists iddrawn($line)] && ![ishighlighted $row]} {
	bolden $row [concat $mainfont bold]
    }
    set fhighlights($row) 1
}

proc hnames_change {name ix op} {
    global highlight_names nhighlights nhl_names mainfont

    # delete previous highlights, if any
    set rows [array names nhighlights]
    if {$rows ne {}} {
	foreach row $rows {
	    if {$nhighlights($row) >= 2} {
		bolden_name $row $mainfont
	    }
	}
	unset nhighlights
	unbolden $rows
    }
    if {[catch {set nhl_names [shellsplit $highlight_names]}]} {
	set nhl_names {}
	return
    }
    drawvisible
}

proc asknamehighlight {row id} {
    global nhl_names nhighlights commitinfo iddrawn mainfont

    if {![info exists commitinfo($id)]} {
	getcommit $id
    }
    set isbold 0
    set author [lindex $commitinfo($id) 1]
    set committer [lindex $commitinfo($id) 3]
    foreach name $nhl_names {
	set pattern "*$name*"
	if {[string match -nocase $pattern $author]} {
	    set isbold 2
	    break
	}
	if {!$isbold && [string match -nocase $pattern $committer]} {
	    set isbold 1
	}
    }
    if {[info exists iddrawn($id)]} {
	if {$isbold && ![ishighlighted $row]} {
	    bolden $row [concat $mainfont bold]
	}
	if {$isbold >= 2} {
	    bolden_name $row [concat $mainfont bold]
	}
    }
    set nhighlights($row) $isbold
}

# Graph layout functions

proc shortids {ids} {
    set res {}
    foreach id $ids {
	if {[llength $id] > 1} {
	    lappend res [shortids $id]
	} elseif {[regexp {^[0-9a-f]{40}$} $id]} {
	    lappend res [string range $id 0 7]
	} else {
	    lappend res $id
	}
    }
    return $res
}

proc incrange {l x o} {
    set n [llength $l]
    while {$x < $n} {
	set e [lindex $l $x]
	if {$e ne {}} {
	    lset l $x [expr {$e + $o}]
	}
	incr x
    }
    return $l
}

proc ntimes {n o} {
    set ret {}
    for {} {$n > 0} {incr n -1} {
	lappend ret $o
    }
    return $ret
}

proc usedinrange {id l1 l2} {
    global children commitrow childlist curview

    if {[info exists commitrow($curview,$id)]} {
	set r $commitrow($curview,$id)
	if {$l1 <= $r && $r <= $l2} {
	    return [expr {$r - $l1 + 1}]
	}
	set kids [lindex $childlist $r]
    } else {
	set kids $children($curview,$id)
    }
    foreach c $kids {
	set r $commitrow($curview,$c)
	if {$l1 <= $r && $r <= $l2} {
	    return [expr {$r - $l1 + 1}]
	}
    }
    return 0
}

proc sanity {row {full 0}} {
    global rowidlist rowoffsets

    set col -1
    set ids [lindex $rowidlist $row]
    foreach id $ids {
	incr col
	if {$id eq {}} continue
	if {$col < [llength $ids] - 1 &&
	    [lsearch -exact -start [expr {$col+1}] $ids $id] >= 0} {
	    puts "oops: [shortids $id] repeated in row $row col $col: {[shortids [lindex $rowidlist $row]]}"
	}
	set o [lindex $rowoffsets $row $col]
	set y $row
	set x $col
	while {$o ne {}} {
	    incr y -1
	    incr x $o
	    if {[lindex $rowidlist $y $x] != $id} {
		puts "oops: rowoffsets wrong at row [expr {$y+1}] col [expr {$x-$o}]"
		puts "  id=[shortids $id] check started at row $row"
		for {set i $row} {$i >= $y} {incr i -1} {
		    puts "  row $i ids={[shortids [lindex $rowidlist $i]]} offs={[lindex $rowoffsets $i]}"
		}
		break
	    }
	    if {!$full} break
	    set o [lindex $rowoffsets $y $x]
	}
    }
}

proc makeuparrow {oid x y z} {
    global rowidlist rowoffsets uparrowlen idrowranges

    for {set i 1} {$i < $uparrowlen && $y > 1} {incr i} {
	incr y -1
	incr x $z
	set off0 [lindex $rowoffsets $y]
	for {set x0 $x} {1} {incr x0} {
	    if {$x0 >= [llength $off0]} {
		set x0 [llength [lindex $rowoffsets [expr {$y-1}]]]
		break
	    }
	    set z [lindex $off0 $x0]
	    if {$z ne {}} {
		incr x0 $z
		break
	    }
	}
	set z [expr {$x0 - $x}]
	lset rowidlist $y [linsert [lindex $rowidlist $y] $x $oid]
	lset rowoffsets $y [linsert [lindex $rowoffsets $y] $x $z]
    }
    set tmp [lreplace [lindex $rowoffsets $y] $x $x {}]
    lset rowoffsets $y [incrange $tmp [expr {$x+1}] -1]
    lappend idrowranges($oid) $y
}

proc initlayout {} {
    global rowidlist rowoffsets displayorder commitlisted
    global rowlaidout rowoptim
    global idinlist rowchk rowrangelist idrowranges
    global numcommits canvxmax canv
    global nextcolor
    global parentlist childlist children
    global colormap rowtextx
    global linesegends

    set numcommits 0
    set displayorder {}
    set commitlisted {}
    set parentlist {}
    set childlist {}
    set rowrangelist {}
    set nextcolor 0
    set rowidlist {{}}
    set rowoffsets {{}}
    catch {unset idinlist}
    catch {unset rowchk}
    set rowlaidout 0
    set rowoptim 0
    set canvxmax [$canv cget -width]
    catch {unset colormap}
    catch {unset rowtextx}
    catch {unset idrowranges}
    set linesegends {}
}

proc setcanvscroll {} {
    global canv canv2 canv3 numcommits linespc canvxmax canvy0

    set ymax [expr {$canvy0 + ($numcommits - 0.5) * $linespc + 2}]
    $canv conf -scrollregion [list 0 0 $canvxmax $ymax]
    $canv2 conf -scrollregion [list 0 0 0 $ymax]
    $canv3 conf -scrollregion [list 0 0 0 $ymax]
}

proc visiblerows {} {
    global canv numcommits linespc

    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax eq {} || $ymax == 0} return
    set f [$canv yview]
    set y0 [expr {int([lindex $f 0] * $ymax)}]
    set r0 [expr {int(($y0 - 3) / $linespc) - 1}]
    if {$r0 < 0} {
	set r0 0
    }
    set y1 [expr {int([lindex $f 1] * $ymax)}]
    set r1 [expr {int(($y1 - 3) / $linespc) + 1}]
    if {$r1 >= $numcommits} {
	set r1 [expr {$numcommits - 1}]
    }
    return [list $r0 $r1]
}

proc layoutmore {} {
    global rowlaidout rowoptim commitidx numcommits optim_delay
    global uparrowlen curview

    set row $rowlaidout
    set rowlaidout [layoutrows $row $commitidx($curview) 0]
    set orow [expr {$rowlaidout - $uparrowlen - 1}]
    if {$orow > $rowoptim} {
	optimize_rows $rowoptim 0 $orow
	set rowoptim $orow
    }
    set canshow [expr {$rowoptim - $optim_delay}]
    if {$canshow > $numcommits} {
	showstuff $canshow
    }
}

proc showstuff {canshow} {
    global numcommits commitrow pending_select selectedline
    global linesegends idrowranges idrangedrawn curview

    if {$numcommits == 0} {
	global phase
	set phase "incrdraw"
	allcanvs delete all
    }
    set row $numcommits
    set numcommits $canshow
    setcanvscroll
    set rows [visiblerows]
    set r0 [lindex $rows 0]
    set r1 [lindex $rows 1]
    set selrow -1
    for {set r $row} {$r < $canshow} {incr r} {
	foreach id [lindex $linesegends [expr {$r+1}]] {
	    set i -1
	    foreach {s e} [rowranges $id] {
		incr i
		if {$e ne {} && $e < $numcommits && $s <= $r1 && $e >= $r0
		    && ![info exists idrangedrawn($id,$i)]} {
		    drawlineseg $id $i
		    set idrangedrawn($id,$i) 1
		}
	    }
	}
    }
    if {$canshow > $r1} {
	set canshow $r1
    }
    while {$row < $canshow} {
	drawcmitrow $row
	incr row
    }
    if {[info exists pending_select] &&
	[info exists commitrow($curview,$pending_select)] &&
	$commitrow($curview,$pending_select) < $numcommits} {
	selectline $commitrow($curview,$pending_select) 1
    }
    if {![info exists selectedline] && ![info exists pending_select]} {
	selectline 0 1
    }
}

proc layoutrows {row endrow last} {
    global rowidlist rowoffsets displayorder
    global uparrowlen downarrowlen maxwidth mingaplen
    global childlist parentlist
    global idrowranges linesegends
    global commitidx curview
    global idinlist rowchk rowrangelist

    set idlist [lindex $rowidlist $row]
    set offs [lindex $rowoffsets $row]
    while {$row < $endrow} {
	set id [lindex $displayorder $row]
	set oldolds {}
	set newolds {}
	foreach p [lindex $parentlist $row] {
	    if {![info exists idinlist($p)]} {
		lappend newolds $p
	    } elseif {!$idinlist($p)} {
		lappend oldolds $p
	    }
	}
	set lse {}
	set nev [expr {[llength $idlist] + [llength $newolds]
		       + [llength $oldolds] - $maxwidth + 1}]
	if {$nev > 0} {
	    if {!$last &&
		$row + $uparrowlen + $mingaplen >= $commitidx($curview)} break
	    for {set x [llength $idlist]} {[incr x -1] >= 0} {} {
		set i [lindex $idlist $x]
		if {![info exists rowchk($i)] || $row >= $rowchk($i)} {
		    set r [usedinrange $i [expr {$row - $downarrowlen}] \
			       [expr {$row + $uparrowlen + $mingaplen}]]
		    if {$r == 0} {
			set idlist [lreplace $idlist $x $x]
			set offs [lreplace $offs $x $x]
			set offs [incrange $offs $x 1]
			set idinlist($i) 0
			set rm1 [expr {$row - 1}]
			lappend lse $i
			lappend idrowranges($i) $rm1
			if {[incr nev -1] <= 0} break
			continue
		    }
		    set rowchk($id) [expr {$row + $r}]
		}
	    }
	    lset rowidlist $row $idlist
	    lset rowoffsets $row $offs
	}
	lappend linesegends $lse
	set col [lsearch -exact $idlist $id]
	if {$col < 0} {
	    set col [llength $idlist]
	    lappend idlist $id
	    lset rowidlist $row $idlist
	    set z {}
	    if {[lindex $childlist $row] ne {}} {
		set z [expr {[llength [lindex $rowidlist [expr {$row-1}]]] - $col}]
		unset idinlist($id)
	    }
	    lappend offs $z
	    lset rowoffsets $row $offs
	    if {$z ne {}} {
		makeuparrow $id $col $row $z
	    }
	} else {
	    unset idinlist($id)
	}
	set ranges {}
	if {[info exists idrowranges($id)]} {
	    set ranges $idrowranges($id)
	    lappend ranges $row
	    unset idrowranges($id)
	}
	lappend rowrangelist $ranges
	incr row
	set offs [ntimes [llength $idlist] 0]
	set l [llength $newolds]
	set idlist [eval lreplace \$idlist $col $col $newolds]
	set o 0
	if {$l != 1} {
	    set offs [lrange $offs 0 [expr {$col - 1}]]
	    foreach x $newolds {
		lappend offs {}
		incr o -1
	    }
	    incr o
	    set tmp [expr {[llength $idlist] - [llength $offs]}]
	    if {$tmp > 0} {
		set offs [concat $offs [ntimes $tmp $o]]
	    }
	} else {
	    lset offs $col {}
	}
	foreach i $newolds {
	    set idinlist($i) 1
	    set idrowranges($i) $row
	}
	incr col $l
	foreach oid $oldolds {
	    set idinlist($oid) 1
	    set idlist [linsert $idlist $col $oid]
	    set offs [linsert $offs $col $o]
	    makeuparrow $oid $col $row $o
	    incr col
	}
	lappend rowidlist $idlist
	lappend rowoffsets $offs
    }
    return $row
}

proc addextraid {id row} {
    global displayorder commitrow commitinfo
    global commitidx commitlisted
    global parentlist childlist children curview

    incr commitidx($curview)
    lappend displayorder $id
    lappend commitlisted 0
    lappend parentlist {}
    set commitrow($curview,$id) $row
    readcommit $id
    if {![info exists commitinfo($id)]} {
	set commitinfo($id) {"No commit information available"}
    }
    if {![info exists children($curview,$id)]} {
	set children($curview,$id) {}
    }
    lappend childlist $children($curview,$id)
}

proc layouttail {} {
    global rowidlist rowoffsets idinlist commitidx curview
    global idrowranges rowrangelist

    set row $commitidx($curview)
    set idlist [lindex $rowidlist $row]
    while {$idlist ne {}} {
	set col [expr {[llength $idlist] - 1}]
	set id [lindex $idlist $col]
	addextraid $id $row
	unset idinlist($id)
	lappend idrowranges($id) $row
	lappend rowrangelist $idrowranges($id)
	unset idrowranges($id)
	incr row
	set offs [ntimes $col 0]
	set idlist [lreplace $idlist $col $col]
	lappend rowidlist $idlist
	lappend rowoffsets $offs
    }

    foreach id [array names idinlist] {
	addextraid $id $row
	lset rowidlist $row [list $id]
	lset rowoffsets $row 0
	makeuparrow $id 0 $row 0
	lappend idrowranges($id) $row
	lappend rowrangelist $idrowranges($id)
	unset idrowranges($id)
	incr row
	lappend rowidlist {}
	lappend rowoffsets {}
    }
}

proc insert_pad {row col npad} {
    global rowidlist rowoffsets

    set pad [ntimes $npad {}]
    lset rowidlist $row [eval linsert [list [lindex $rowidlist $row]] $col $pad]
    set tmp [eval linsert [list [lindex $rowoffsets $row]] $col $pad]
    lset rowoffsets $row [incrange $tmp [expr {$col + $npad}] [expr {-$npad}]]
}

proc optimize_rows {row col endrow} {
    global rowidlist rowoffsets idrowranges displayorder

    for {} {$row < $endrow} {incr row} {
	set idlist [lindex $rowidlist $row]
	set offs [lindex $rowoffsets $row]
	set haspad 0
	for {} {$col < [llength $offs]} {incr col} {
	    if {[lindex $idlist $col] eq {}} {
		set haspad 1
		continue
	    }
	    set z [lindex $offs $col]
	    if {$z eq {}} continue
	    set isarrow 0
	    set x0 [expr {$col + $z}]
	    set y0 [expr {$row - 1}]
	    set z0 [lindex $rowoffsets $y0 $x0]
	    if {$z0 eq {}} {
		set id [lindex $idlist $col]
		set ranges [rowranges $id]
		if {$ranges ne {} && $y0 > [lindex $ranges 0]} {
		    set isarrow 1
		}
	    }
	    if {$z < -1 || ($z < 0 && $isarrow)} {
		set npad [expr {-1 - $z + $isarrow}]
		set offs [incrange $offs $col $npad]
		insert_pad $y0 $x0 $npad
		if {$y0 > 0} {
		    optimize_rows $y0 $x0 $row
		}
		set z [lindex $offs $col]
		set x0 [expr {$col + $z}]
		set z0 [lindex $rowoffsets $y0 $x0]
	    } elseif {$z > 1 || ($z > 0 && $isarrow)} {
		set npad [expr {$z - 1 + $isarrow}]
		set y1 [expr {$row + 1}]
		set offs2 [lindex $rowoffsets $y1]
		set x1 -1
		foreach z $offs2 {
		    incr x1
		    if {$z eq {} || $x1 + $z < $col} continue
		    if {$x1 + $z > $col} {
			incr npad
		    }
		    lset rowoffsets $y1 [incrange $offs2 $x1 $npad]
		    break
		}
		set pad [ntimes $npad {}]
		set idlist [eval linsert \$idlist $col $pad]
		set tmp [eval linsert \$offs $col $pad]
		incr col $npad
		set offs [incrange $tmp $col [expr {-$npad}]]
		set z [lindex $offs $col]
		set haspad 1
	    }
	    if {$z0 eq {} && !$isarrow} {
		# this line links to its first child on row $row-2
		set rm2 [expr {$row - 2}]
		set id [lindex $displayorder $rm2]
		set xc [lsearch -exact [lindex $rowidlist $rm2] $id]
		if {$xc >= 0} {
		    set z0 [expr {$xc - $x0}]
		}
	    }
	    if {$z0 ne {} && $z < 0 && $z0 > 0} {
		insert_pad $y0 $x0 1
		set offs [incrange $offs $col 1]
		optimize_rows $y0 [expr {$x0 + 1}] $row
	    }
	}
	if {!$haspad} {
	    set o {}
	    for {set col [llength $idlist]} {[incr col -1] >= 0} {} {
		set o [lindex $offs $col]
		if {$o eq {}} {
		    # check if this is the link to the first child
		    set id [lindex $idlist $col]
		    set ranges [rowranges $id]
		    if {$ranges ne {} && $row == [lindex $ranges 0]} {
			# it is, work out offset to child
			set y0 [expr {$row - 1}]
			set id [lindex $displayorder $y0]
			set x0 [lsearch -exact [lindex $rowidlist $y0] $id]
			if {$x0 >= 0} {
			    set o [expr {$x0 - $col}]
			}
		    }
		}
		if {$o eq {} || $o <= 0} break
	    }
	    if {$o ne {} && [incr col] < [llength $idlist]} {
		set y1 [expr {$row + 1}]
		set offs2 [lindex $rowoffsets $y1]
		set x1 -1
		foreach z $offs2 {
		    incr x1
		    if {$z eq {} || $x1 + $z < $col} continue
		    lset rowoffsets $y1 [incrange $offs2 $x1 1]
		    break
		}
		set idlist [linsert $idlist $col {}]
		set tmp [linsert $offs $col {}]
		incr col
		set offs [incrange $tmp $col -1]
	    }
	}
	lset rowidlist $row $idlist
	lset rowoffsets $row $offs
	set col 0
    }
}

proc xc {row col} {
    global canvx0 linespc
    return [expr {$canvx0 + $col * $linespc}]
}

proc yc {row} {
    global canvy0 linespc
    return [expr {$canvy0 + $row * $linespc}]
}

proc linewidth {id} {
    global thickerline lthickness

    set wid $lthickness
    if {[info exists thickerline] && $id eq $thickerline} {
	set wid [expr {2 * $lthickness}]
    }
    return $wid
}

proc rowranges {id} {
    global phase idrowranges commitrow rowlaidout rowrangelist curview

    set ranges {}
    if {$phase eq {} ||
	([info exists commitrow($curview,$id)]
	 && $commitrow($curview,$id) < $rowlaidout)} {
	set ranges [lindex $rowrangelist $commitrow($curview,$id)]
    } elseif {[info exists idrowranges($id)]} {
	set ranges $idrowranges($id)
    }
    return $ranges
}

proc drawlineseg {id i} {
    global rowoffsets rowidlist
    global displayorder
    global canv colormap linespc
    global numcommits commitrow curview

    set ranges [rowranges $id]
    set downarrow 1
    if {[info exists commitrow($curview,$id)]
	&& $commitrow($curview,$id) < $numcommits} {
	set downarrow [expr {$i < [llength $ranges] / 2 - 1}]
    } else {
	set downarrow 1
    }
    set startrow [lindex $ranges [expr {2 * $i}]]
    set row [lindex $ranges [expr {2 * $i + 1}]]
    if {$startrow == $row} return
    assigncolor $id
    set coords {}
    set col [lsearch -exact [lindex $rowidlist $row] $id]
    if {$col < 0} {
	puts "oops: drawline: id $id not on row $row"
	return
    }
    set lasto {}
    set ns 0
    while {1} {
	set o [lindex $rowoffsets $row $col]
	if {$o eq {}} break
	if {$o ne $lasto} {
	    # changing direction
	    set x [xc $row $col]
	    set y [yc $row]
	    lappend coords $x $y
	    set lasto $o
	}
	incr col $o
	incr row -1
    }
    set x [xc $row $col]
    set y [yc $row]
    lappend coords $x $y
    if {$i == 0} {
	# draw the link to the first child as part of this line
	incr row -1
	set child [lindex $displayorder $row]
	set ccol [lsearch -exact [lindex $rowidlist $row] $child]
	if {$ccol >= 0} {
	    set x [xc $row $ccol]
	    set y [yc $row]
	    if {$ccol < $col - 1} {
		lappend coords [xc $row [expr {$col - 1}]] [yc $row]
	    } elseif {$ccol > $col + 1} {
		lappend coords [xc $row [expr {$col + 1}]] [yc $row]
	    }
	    lappend coords $x $y
	}
    }
    if {[llength $coords] < 4} return
    if {$downarrow} {
	# This line has an arrow at the lower end: check if the arrow is
	# on a diagonal segment, and if so, work around the Tk 8.4
	# refusal to draw arrows on diagonal lines.
	set x0 [lindex $coords 0]
	set x1 [lindex $coords 2]
	if {$x0 != $x1} {
	    set y0 [lindex $coords 1]
	    set y1 [lindex $coords 3]
	    if {$y0 - $y1 <= 2 * $linespc && $x1 == [lindex $coords 4]} {
		# we have a nearby vertical segment, just trim off the diag bit
		set coords [lrange $coords 2 end]
	    } else {
		set slope [expr {($x0 - $x1) / ($y0 - $y1)}]
		set xi [expr {$x0 - $slope * $linespc / 2}]
		set yi [expr {$y0 - $linespc / 2}]
		set coords [lreplace $coords 0 1 $xi $y0 $xi $yi]
	    }
	}
    }
    set arrow [expr {2 * ($i > 0) + $downarrow}]
    set arrow [lindex {none first last both} $arrow]
    set t [$canv create line $coords -width [linewidth $id] \
	       -fill $colormap($id) -tags lines.$id -arrow $arrow]
    $canv lower $t
    bindline $t $id
}

proc drawparentlinks {id row col olds} {
    global rowidlist canv colormap

    set row2 [expr {$row + 1}]
    set x [xc $row $col]
    set y [yc $row]
    set y2 [yc $row2]
    set ids [lindex $rowidlist $row2]
    # rmx = right-most X coord used
    set rmx 0
    foreach p $olds {
	set i [lsearch -exact $ids $p]
	if {$i < 0} {
	    puts "oops, parent $p of $id not in list"
	    continue
	}
	set x2 [xc $row2 $i]
	if {$x2 > $rmx} {
	    set rmx $x2
	}
	set ranges [rowranges $p]
	if {$ranges ne {} && $row2 == [lindex $ranges 0]
	    && $row2 < [lindex $ranges 1]} {
	    # drawlineseg will do this one for us
	    continue
	}
	assigncolor $p
	# should handle duplicated parents here...
	set coords [list $x $y]
	if {$i < $col - 1} {
	    lappend coords [xc $row [expr {$i + 1}]] $y
	} elseif {$i > $col + 1} {
	    lappend coords [xc $row [expr {$i - 1}]] $y
	}
	lappend coords $x2 $y2
	set t [$canv create line $coords -width [linewidth $p] \
		   -fill $colormap($p) -tags lines.$p]
	$canv lower $t
	bindline $t $p
    }
    return $rmx
}

proc drawlines {id} {
    global colormap canv
    global idrangedrawn
    global children iddrawn commitrow rowidlist curview

    $canv delete lines.$id
    set nr [expr {[llength [rowranges $id]] / 2}]
    for {set i 0} {$i < $nr} {incr i} {
	if {[info exists idrangedrawn($id,$i)]} {
	    drawlineseg $id $i
	}
    }
    foreach child $children($curview,$id) {
	if {[info exists iddrawn($child)]} {
	    set row $commitrow($curview,$child)
	    set col [lsearch -exact [lindex $rowidlist $row] $child]
	    if {$col >= 0} {
		drawparentlinks $child $row $col [list $id]
	    }
	}
    }
}

proc drawcmittext {id row col rmx} {
    global linespc canv canv2 canv3 canvy0
    global commitlisted commitinfo rowidlist
    global rowtextx idpos idtags idheads idotherrefs
    global linehtag linentag linedtag
    global mainfont canvxmax

    set ofill [expr {[lindex $commitlisted $row]? "blue": "white"}]
    set x [xc $row $col]
    set y [yc $row]
    set orad [expr {$linespc / 3}]
    set t [$canv create oval [expr {$x - $orad}] [expr {$y - $orad}] \
	       [expr {$x + $orad - 1}] [expr {$y + $orad - 1}] \
	       -fill $ofill -outline black -width 1]
    $canv raise $t
    $canv bind $t <1> {selcanvline {} %x %y}
    set xt [xc $row [llength [lindex $rowidlist $row]]]
    if {$xt < $rmx} {
	set xt $rmx
    }
    set rowtextx($row) $xt
    set idpos($id) [list $x $xt $y]
    if {[info exists idtags($id)] || [info exists idheads($id)]
	|| [info exists idotherrefs($id)]} {
	set xt [drawtags $id $x $xt $y]
    }
    set headline [lindex $commitinfo($id) 0]
    set name [lindex $commitinfo($id) 1]
    set date [lindex $commitinfo($id) 2]
    set date [formatdate $date]
    set font $mainfont
    set nfont $mainfont
    set isbold [ishighlighted $row]
    if {$isbold > 0} {
	lappend font bold
	if {$isbold > 1} {
	    lappend nfont bold
	}
    }
    set linehtag($row) [$canv create text $xt $y -anchor w \
			    -text $headline -font $font]
    $canv bind $linehtag($row) <Button-3> "rowmenu %X %Y $id"
    set linentag($row) [$canv2 create text 3 $y -anchor w \
			    -text $name -font $nfont]
    set linedtag($row) [$canv3 create text 3 $y -anchor w \
			    -text $date -font $mainfont]
    set xr [expr {$xt + [font measure $mainfont $headline]}]
    if {$xr > $canvxmax} {
	set canvxmax $xr
	setcanvscroll
    }
}

proc drawcmitrow {row} {
    global displayorder rowidlist
    global idrangedrawn iddrawn
    global commitinfo parentlist numcommits
    global filehighlight fhighlights nhl_names nhighlights
    global hlview vhighlights

    if {$row >= $numcommits} return
    foreach id [lindex $rowidlist $row] {
	if {$id eq {}} continue
	set i -1
	foreach {s e} [rowranges $id] {
	    incr i
	    if {$row < $s} continue
	    if {$e eq {}} break
	    if {$row <= $e} {
		if {$e < $numcommits && ![info exists idrangedrawn($id,$i)]} {
		    drawlineseg $id $i
		    set idrangedrawn($id,$i) 1
		}
		break
	    }
	}
    }

    set id [lindex $displayorder $row]
    if {[info exists hlview] && ![info exists vhighlights($row)]} {
	askvhighlight $row $id
    }
    if {[info exists filehighlight] && ![info exists fhighlights($row)]} {
	askfilehighlight $row $id
    }
    if {$nhl_names ne {} && ![info exists nhighlights($row)]} {
	asknamehighlight $row $id
    }
    if {[info exists iddrawn($id)]} return
    set col [lsearch -exact [lindex $rowidlist $row] $id]
    if {$col < 0} {
	puts "oops, row $row id $id not in list"
	return
    }
    if {![info exists commitinfo($id)]} {
	getcommit $id
    }
    assigncolor $id
    set olds [lindex $parentlist $row]
    if {$olds ne {}} {
	set rmx [drawparentlinks $id $row $col $olds]
    } else {
	set rmx 0
    }
    drawcmittext $id $row $col $rmx
    set iddrawn($id) 1
}

proc drawfrac {f0 f1} {
    global numcommits canv
    global linespc

    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax eq {} || $ymax == 0} return
    set y0 [expr {int($f0 * $ymax)}]
    set row [expr {int(($y0 - 3) / $linespc) - 1}]
    if {$row < 0} {
	set row 0
    }
    set y1 [expr {int($f1 * $ymax)}]
    set endrow [expr {int(($y1 - 3) / $linespc) + 1}]
    if {$endrow >= $numcommits} {
	set endrow [expr {$numcommits - 1}]
    }
    for {} {$row <= $endrow} {incr row} {
	drawcmitrow $row
    }
}

proc drawvisible {} {
    global canv
    eval drawfrac [$canv yview]
}

proc clear_display {} {
    global iddrawn idrangedrawn
    global vhighlights fhighlights nhighlights

    allcanvs delete all
    catch {unset iddrawn}
    catch {unset idrangedrawn}
    catch {unset vhighlights}
    catch {unset fhighlights}
    catch {unset nhighlights}
}

proc findcrossings {id} {
    global rowidlist parentlist numcommits rowoffsets displayorder

    set cross {}
    set ccross {}
    foreach {s e} [rowranges $id] {
	if {$e >= $numcommits} {
	    set e [expr {$numcommits - 1}]
	}
	if {$e <= $s} continue
	set x [lsearch -exact [lindex $rowidlist $e] $id]
	if {$x < 0} {
	    puts "findcrossings: oops, no [shortids $id] in row $e"
	    continue
	}
	for {set row $e} {[incr row -1] >= $s} {} {
	    set olds [lindex $parentlist $row]
	    set kid [lindex $displayorder $row]
	    set kidx [lsearch -exact [lindex $rowidlist $row] $kid]
	    if {$kidx < 0} continue
	    set nextrow [lindex $rowidlist [expr {$row + 1}]]
	    foreach p $olds {
		set px [lsearch -exact $nextrow $p]
		if {$px < 0} continue
		if {($kidx < $x && $x < $px) || ($px < $x && $x < $kidx)} {
		    if {[lsearch -exact $ccross $p] >= 0} continue
		    if {$x == $px + ($kidx < $px? -1: 1)} {
			lappend ccross $p
		    } elseif {[lsearch -exact $cross $p] < 0} {
			lappend cross $p
		    }
		}
	    }
	    set inc [lindex $rowoffsets $row $x]
	    if {$inc eq {}} break
	    incr x $inc
	}
    }
    return [concat $ccross {{}} $cross]
}

proc assigncolor {id} {
    global colormap colors nextcolor
    global commitrow parentlist children children curview

    if {[info exists colormap($id)]} return
    set ncolors [llength $colors]
    if {[info exists children($curview,$id)]} {
	set kids $children($curview,$id)
    } else {
	set kids {}
    }
    if {[llength $kids] == 1} {
	set child [lindex $kids 0]
	if {[info exists colormap($child)]
	    && [llength [lindex $parentlist $commitrow($curview,$child)]] == 1} {
	    set colormap($id) $colormap($child)
	    return
	}
    }
    set badcolors {}
    set origbad {}
    foreach x [findcrossings $id] {
	if {$x eq {}} {
	    # delimiter between corner crossings and other crossings
	    if {[llength $badcolors] >= $ncolors - 1} break
	    set origbad $badcolors
	}
	if {[info exists colormap($x)]
	    && [lsearch -exact $badcolors $colormap($x)] < 0} {
	    lappend badcolors $colormap($x)
	}
    }
    if {[llength $badcolors] >= $ncolors} {
	set badcolors $origbad
    }
    set origbad $badcolors
    if {[llength $badcolors] < $ncolors - 1} {
	foreach child $kids {
	    if {[info exists colormap($child)]
		&& [lsearch -exact $badcolors $colormap($child)] < 0} {
		lappend badcolors $colormap($child)
	    }
	    foreach p [lindex $parentlist $commitrow($curview,$child)] {
		if {[info exists colormap($p)]
		    && [lsearch -exact $badcolors $colormap($p)] < 0} {
		    lappend badcolors $colormap($p)
		}
	    }
	}
	if {[llength $badcolors] >= $ncolors} {
	    set badcolors $origbad
	}
    }
    for {set i 0} {$i <= $ncolors} {incr i} {
	set c [lindex $colors $nextcolor]
	if {[incr nextcolor] >= $ncolors} {
	    set nextcolor 0
	}
	if {[lsearch -exact $badcolors $c]} break
    }
    set colormap($id) $c
}

proc bindline {t id} {
    global canv

    $canv bind $t <Enter> "lineenter %x %y $id"
    $canv bind $t <Motion> "linemotion %x %y $id"
    $canv bind $t <Leave> "lineleave $id"
    $canv bind $t <Button-1> "lineclick %x %y $id 1"
}

proc drawtags {id x xt y1} {
    global idtags idheads idotherrefs
    global linespc lthickness
    global canv mainfont commitrow rowtextx curview

    set marks {}
    set ntags 0
    set nheads 0
    if {[info exists idtags($id)]} {
	set marks $idtags($id)
	set ntags [llength $marks]
    }
    if {[info exists idheads($id)]} {
	set marks [concat $marks $idheads($id)]
	set nheads [llength $idheads($id)]
    }
    if {[info exists idotherrefs($id)]} {
	set marks [concat $marks $idotherrefs($id)]
    }
    if {$marks eq {}} {
	return $xt
    }

    set delta [expr {int(0.5 * ($linespc - $lthickness))}]
    set yt [expr {$y1 - 0.5 * $linespc}]
    set yb [expr {$yt + $linespc - 1}]
    set xvals {}
    set wvals {}
    foreach tag $marks {
	set wid [font measure $mainfont $tag]
	lappend xvals $xt
	lappend wvals $wid
	set xt [expr {$xt + $delta + $wid + $lthickness + $linespc}]
    }
    set t [$canv create line $x $y1 [lindex $xvals end] $y1 \
	       -width $lthickness -fill black -tags tag.$id]
    $canv lower $t
    foreach tag $marks x $xvals wid $wvals {
	set xl [expr {$x + $delta}]
	set xr [expr {$x + $delta + $wid + $lthickness}]
	if {[incr ntags -1] >= 0} {
	    # draw a tag
	    set t [$canv create polygon $x [expr {$yt + $delta}] $xl $yt \
		       $xr $yt $xr $yb $xl $yb $x [expr {$yb - $delta}] \
		       -width 1 -outline black -fill yellow -tags tag.$id]
	    $canv bind $t <1> [list showtag $tag 1]
	    set rowtextx($commitrow($curview,$id)) [expr {$xr + $linespc}]
	} else {
	    # draw a head or other ref
	    if {[incr nheads -1] >= 0} {
		set col green
	    } else {
		set col "#ddddff"
	    }
	    set xl [expr {$xl - $delta/2}]
	    $canv create polygon $x $yt $xr $yt $xr $yb $x $yb \
		-width 1 -outline black -fill $col -tags tag.$id
	    if {[regexp {^(remotes/.*/|remotes/)} $tag match remoteprefix]} {
	        set rwid [font measure $mainfont $remoteprefix]
		set xi [expr {$x + 1}]
		set yti [expr {$yt + 1}]
		set xri [expr {$x + $rwid}]
		$canv create polygon $xi $yti $xri $yti $xri $yb $xi $yb \
			-width 0 -fill "#ffddaa" -tags tag.$id
	    }
	}
	set t [$canv create text $xl $y1 -anchor w -text $tag \
		   -font $mainfont -tags tag.$id]
	if {$ntags >= 0} {
	    $canv bind $t <1> [list showtag $tag 1]
	}
    }
    return $xt
}

proc xcoord {i level ln} {
    global canvx0 xspc1 xspc2

    set x [expr {$canvx0 + $i * $xspc1($ln)}]
    if {$i > 0 && $i == $level} {
	set x [expr {$x + 0.5 * ($xspc2 - $xspc1($ln))}]
    } elseif {$i > $level} {
	set x [expr {$x + $xspc2 - $xspc1($ln)}]
    }
    return $x
}

proc show_status {msg} {
    global canv mainfont

    clear_display
    $canv create text 3 3 -anchor nw -text $msg -font $mainfont -tags textitems
}

proc finishcommits {} {
    global commitidx phase curview
    global canv mainfont ctext maincursor textcursor
    global findinprogress pending_select

    if {$commitidx($curview) > 0} {
	drawrest
    } else {
	show_status "No commits selected"
    }
    set phase {}
    catch {unset pending_select}
}

# Don't change the text pane cursor if it is currently the hand cursor,
# showing that we are over a sha1 ID link.
proc settextcursor {c} {
    global ctext curtextcursor

    if {[$ctext cget -cursor] == $curtextcursor} {
	$ctext config -cursor $c
    }
    set curtextcursor $c
}

proc nowbusy {what} {
    global isbusy

    if {[array names isbusy] eq {}} {
	. config -cursor watch
	settextcursor watch
    }
    set isbusy($what) 1
}

proc notbusy {what} {
    global isbusy maincursor textcursor

    catch {unset isbusy($what)}
    if {[array names isbusy] eq {}} {
	. config -cursor $maincursor
	settextcursor $textcursor
    }
}

proc drawrest {} {
    global numcommits
    global startmsecs
    global canvy0 numcommits linespc
    global rowlaidout commitidx curview
    global pending_select

    set row $rowlaidout
    layoutrows $rowlaidout $commitidx($curview) 1
    layouttail
    optimize_rows $row 0 $commitidx($curview)
    showstuff $commitidx($curview)
    if {[info exists pending_select]} {
	selectline 0 1
    }

    set drawmsecs [expr {[clock clicks -milliseconds] - $startmsecs}]
    #puts "overall $drawmsecs ms for $numcommits commits"
}

proc findmatches {f} {
    global findtype foundstring foundstrlen
    if {$findtype == "Regexp"} {
	set matches [regexp -indices -all -inline $foundstring $f]
    } else {
	if {$findtype == "IgnCase"} {
	    set str [string tolower $f]
	} else {
	    set str $f
	}
	set matches {}
	set i 0
	while {[set j [string first $foundstring $str $i]] >= 0} {
	    lappend matches [list $j [expr {$j+$foundstrlen-1}]]
	    set i [expr {$j + $foundstrlen}]
	}
    }
    return $matches
}

proc dofind {} {
    global findtype findloc findstring markedmatches commitinfo
    global numcommits displayorder linehtag linentag linedtag
    global mainfont canv canv2 canv3 selectedline
    global matchinglines foundstring foundstrlen matchstring
    global commitdata

    stopfindproc
    unmarkmatches
    focus .
    set matchinglines {}
    if {$findloc == "Pickaxe"} {
	findpatches
	return
    }
    if {$findtype == "IgnCase"} {
	set foundstring [string tolower $findstring]
    } else {
	set foundstring $findstring
    }
    set foundstrlen [string length $findstring]
    if {$foundstrlen == 0} return
    regsub -all {[*?\[\\]} $foundstring {\\&} matchstring
    set matchstring "*$matchstring*"
    if {$findloc == "Files"} {
	findfiles
	return
    }
    if {![info exists selectedline]} {
	set oldsel -1
    } else {
	set oldsel $selectedline
    }
    set didsel 0
    set fldtypes {Headline Author Date Committer CDate Comment}
    set l -1
    foreach id $displayorder {
	set d $commitdata($id)
	incr l
	if {$findtype == "Regexp"} {
	    set doesmatch [regexp $foundstring $d]
	} elseif {$findtype == "IgnCase"} {
	    set doesmatch [string match -nocase $matchstring $d]
	} else {
	    set doesmatch [string match $matchstring $d]
	}
	if {!$doesmatch} continue
	if {![info exists commitinfo($id)]} {
	    getcommit $id
	}
	set info $commitinfo($id)
	set doesmatch 0
	foreach f $info ty $fldtypes {
	    if {$findloc != "All fields" && $findloc != $ty} {
		continue
	    }
	    set matches [findmatches $f]
	    if {$matches == {}} continue
	    set doesmatch 1
	    if {$ty == "Headline"} {
		drawcmitrow $l
		markmatches $canv $l $f $linehtag($l) $matches $mainfont
	    } elseif {$ty == "Author"} {
		drawcmitrow $l
		markmatches $canv2 $l $f $linentag($l) $matches $mainfont
	    } elseif {$ty == "Date"} {
		drawcmitrow $l
		markmatches $canv3 $l $f $linedtag($l) $matches $mainfont
	    }
	}
	if {$doesmatch} {
	    lappend matchinglines $l
	    if {!$didsel && $l > $oldsel} {
		findselectline $l
		set didsel 1
	    }
	}
    }
    if {$matchinglines == {}} {
	bell
    } elseif {!$didsel} {
	findselectline [lindex $matchinglines 0]
    }
}

proc findselectline {l} {
    global findloc commentend ctext
    selectline $l 1
    if {$findloc == "All fields" || $findloc == "Comments"} {
	# highlight the matches in the comments
	set f [$ctext get 1.0 $commentend]
	set matches [findmatches $f]
	foreach match $matches {
	    set start [lindex $match 0]
	    set end [expr {[lindex $match 1] + 1}]
	    $ctext tag add found "1.0 + $start c" "1.0 + $end c"
	}
    }
}

proc findnext {restart} {
    global matchinglines selectedline
    if {![info exists matchinglines]} {
	if {$restart} {
	    dofind
	}
	return
    }
    if {![info exists selectedline]} return
    foreach l $matchinglines {
	if {$l > $selectedline} {
	    findselectline $l
	    return
	}
    }
    bell
}

proc findprev {} {
    global matchinglines selectedline
    if {![info exists matchinglines]} {
	dofind
	return
    }
    if {![info exists selectedline]} return
    set prev {}
    foreach l $matchinglines {
	if {$l >= $selectedline} break
	set prev $l
    }
    if {$prev != {}} {
	findselectline $prev
    } else {
	bell
    }
}

proc findlocchange {name ix op} {
    global findloc findtype findtypemenu
    if {$findloc == "Pickaxe"} {
	set findtype Exact
	set state disabled
    } else {
	set state normal
    }
    $findtypemenu entryconf 1 -state $state
    $findtypemenu entryconf 2 -state $state
}

proc stopfindproc {{done 0}} {
    global findprocpid findprocfile findids
    global ctext findoldcursor phase maincursor textcursor
    global findinprogress

    catch {unset findids}
    if {[info exists findprocpid]} {
	if {!$done} {
	    catch {exec kill $findprocpid}
	}
	catch {close $findprocfile}
	unset findprocpid
    }
    catch {unset findinprogress}
    notbusy find
}

proc findpatches {} {
    global findstring selectedline numcommits
    global findprocpid findprocfile
    global finddidsel ctext displayorder findinprogress
    global findinsertpos

    if {$numcommits == 0} return

    # make a list of all the ids to search, starting at the one
    # after the selected line (if any)
    if {[info exists selectedline]} {
	set l $selectedline
    } else {
	set l -1
    }
    set inputids {}
    for {set i 0} {$i < $numcommits} {incr i} {
	if {[incr l] >= $numcommits} {
	    set l 0
	}
	append inputids [lindex $displayorder $l] "\n"
    }

    if {[catch {
	set f [open [list | git-diff-tree --stdin -s -r -S$findstring \
			 << $inputids] r]
    } err]} {
	error_popup "Error starting search process: $err"
	return
    }

    set findinsertpos end
    set findprocfile $f
    set findprocpid [pid $f]
    fconfigure $f -blocking 0
    fileevent $f readable readfindproc
    set finddidsel 0
    nowbusy find
    set findinprogress 1
}

proc readfindproc {} {
    global findprocfile finddidsel
    global commitrow matchinglines findinsertpos curview

    set n [gets $findprocfile line]
    if {$n < 0} {
	if {[eof $findprocfile]} {
	    stopfindproc 1
	    if {!$finddidsel} {
		bell
	    }
	}
	return
    }
    if {![regexp {^[0-9a-f]{40}} $line id]} {
	error_popup "Can't parse git-diff-tree output: $line"
	stopfindproc
	return
    }
    if {![info exists commitrow($curview,$id)]} {
	puts stderr "spurious id: $id"
	return
    }
    set l $commitrow($curview,$id)
    insertmatch $l $id
}

proc insertmatch {l id} {
    global matchinglines findinsertpos finddidsel

    if {$findinsertpos == "end"} {
	if {$matchinglines != {} && $l < [lindex $matchinglines 0]} {
	    set matchinglines [linsert $matchinglines 0 $l]
	    set findinsertpos 1
	} else {
	    lappend matchinglines $l
	}
    } else {
	set matchinglines [linsert $matchinglines $findinsertpos $l]
	incr findinsertpos
    }
    markheadline $l $id
    if {!$finddidsel} {
	findselectline $l
	set finddidsel 1
    }
}

proc findfiles {} {
    global selectedline numcommits displayorder ctext
    global ffileline finddidsel parentlist
    global findinprogress findstartline findinsertpos
    global treediffs fdiffid fdiffsneeded fdiffpos
    global findmergefiles

    if {$numcommits == 0} return

    if {[info exists selectedline]} {
	set l [expr {$selectedline + 1}]
    } else {
	set l 0
    }
    set ffileline $l
    set findstartline $l
    set diffsneeded {}
    set fdiffsneeded {}
    while 1 {
	set id [lindex $displayorder $l]
	if {$findmergefiles || [llength [lindex $parentlist $l]] == 1} {
	    if {![info exists treediffs($id)]} {
		append diffsneeded "$id\n"
		lappend fdiffsneeded $id
	    }
	}
	if {[incr l] >= $numcommits} {
	    set l 0
	}
	if {$l == $findstartline} break
    }

    # start off a git-diff-tree process if needed
    if {$diffsneeded ne {}} {
	if {[catch {
	    set df [open [list | git-diff-tree -r --stdin << $diffsneeded] r]
	} err ]} {
	    error_popup "Error starting search process: $err"
	    return
	}
	catch {unset fdiffid}
	set fdiffpos 0
	fconfigure $df -blocking 0
	fileevent $df readable [list readfilediffs $df]
    }

    set finddidsel 0
    set findinsertpos end
    set id [lindex $displayorder $l]
    nowbusy find
    set findinprogress 1
    findcont
    update
}

proc readfilediffs {df} {
    global findid fdiffid fdiffs

    set n [gets $df line]
    if {$n < 0} {
	if {[eof $df]} {
	    donefilediff
	    if {[catch {close $df} err]} {
		stopfindproc
		bell
		error_popup "Error in git-diff-tree: $err"
	    } elseif {[info exists findid]} {
		set id $findid
		stopfindproc
		bell
		error_popup "Couldn't find diffs for $id"
	    }
	}
	return
    }
    if {[regexp {^([0-9a-f]{40})$} $line match id]} {
	# start of a new string of diffs
	donefilediff
	set fdiffid $id
	set fdiffs {}
    } elseif {[string match ":*" $line]} {
	lappend fdiffs [lindex $line 5]
    }
}

proc donefilediff {} {
    global fdiffid fdiffs treediffs findid
    global fdiffsneeded fdiffpos

    if {[info exists fdiffid]} {
	while {[lindex $fdiffsneeded $fdiffpos] ne $fdiffid
	       && $fdiffpos < [llength $fdiffsneeded]} {
	    # git-diff-tree doesn't output anything for a commit
	    # which doesn't change anything
	    set nullid [lindex $fdiffsneeded $fdiffpos]
	    set treediffs($nullid) {}
	    if {[info exists findid] && $nullid eq $findid} {
		unset findid
		findcont
	    }
	    incr fdiffpos
	}
	incr fdiffpos

	if {![info exists treediffs($fdiffid)]} {
	    set treediffs($fdiffid) $fdiffs
	}
	if {[info exists findid] && $fdiffid eq $findid} {
	    unset findid
	    findcont
	}
    }
}

proc findcont {} {
    global findid treediffs parentlist
    global ffileline findstartline finddidsel
    global displayorder numcommits matchinglines findinprogress
    global findmergefiles

    set l $ffileline
    while {1} {
	set id [lindex $displayorder $l]
	if {$findmergefiles || [llength [lindex $parentlist $l]] == 1} {
	    if {![info exists treediffs($id)]} {
		set findid $id
		set ffileline $l
		return
	    }
	    set doesmatch 0
	    foreach f $treediffs($id) {
		set x [findmatches $f]
		if {$x != {}} {
		    set doesmatch 1
		    break
		}
	    }
	    if {$doesmatch} {
		insertmatch $l $id
	    }
	}
	if {[incr l] >= $numcommits} {
	    set l 0
	}
	if {$l == $findstartline} break
    }
    stopfindproc
    if {!$finddidsel} {
	bell
    }
}

# mark a commit as matching by putting a yellow background
# behind the headline
proc markheadline {l id} {
    global canv mainfont linehtag

    drawcmitrow $l
    set bbox [$canv bbox $linehtag($l)]
    set t [$canv create rect $bbox -outline {} -tags matches -fill yellow]
    $canv lower $t
}

# mark the bits of a headline, author or date that match a find string
proc markmatches {canv l str tag matches font} {
    set bbox [$canv bbox $tag]
    set x0 [lindex $bbox 0]
    set y0 [lindex $bbox 1]
    set y1 [lindex $bbox 3]
    foreach match $matches {
	set start [lindex $match 0]
	set end [lindex $match 1]
	if {$start > $end} continue
	set xoff [font measure $font [string range $str 0 [expr {$start-1}]]]
	set xlen [font measure $font [string range $str 0 [expr {$end}]]]
	set t [$canv create rect [expr {$x0+$xoff}] $y0 \
		   [expr {$x0+$xlen+2}] $y1 \
		   -outline {} -tags matches -fill yellow]
	$canv lower $t
    }
}

proc unmarkmatches {} {
    global matchinglines findids
    allcanvs delete matches
    catch {unset matchinglines}
    catch {unset findids}
}

proc selcanvline {w x y} {
    global canv canvy0 ctext linespc
    global rowtextx
    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax == {}} return
    set yfrac [lindex [$canv yview] 0]
    set y [expr {$y + $yfrac * $ymax}]
    set l [expr {int(($y - $canvy0) / $linespc + 0.5)}]
    if {$l < 0} {
	set l 0
    }
    if {$w eq $canv} {
	if {![info exists rowtextx($l)] || $x < $rowtextx($l)} return
    }
    unmarkmatches
    selectline $l 1
}

proc commit_descriptor {p} {
    global commitinfo
    if {![info exists commitinfo($p)]} {
	getcommit $p
    }
    set l "..."
    if {[llength $commitinfo($p)] > 1} {
	set l [lindex $commitinfo($p) 0]
    }
    return "$p ($l)"
}

# append some text to the ctext widget, and make any SHA1 ID
# that we know about be a clickable link.
proc appendwithlinks {text} {
    global ctext commitrow linknum curview

    set start [$ctext index "end - 1c"]
    $ctext insert end $text
    $ctext insert end "\n"
    set links [regexp -indices -all -inline {[0-9a-f]{40}} $text]
    foreach l $links {
	set s [lindex $l 0]
	set e [lindex $l 1]
	set linkid [string range $text $s $e]
	if {![info exists commitrow($curview,$linkid)]} continue
	incr e
	$ctext tag add link "$start + $s c" "$start + $e c"
	$ctext tag add link$linknum "$start + $s c" "$start + $e c"
	$ctext tag bind link$linknum <1> \
	    [list selectline $commitrow($curview,$linkid) 1]
	incr linknum
    }
    $ctext tag conf link -foreground blue -underline 1
    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
}

proc viewnextline {dir} {
    global canv linespc

    $canv delete hover
    set ymax [lindex [$canv cget -scrollregion] 3]
    set wnow [$canv yview]
    set wtop [expr {[lindex $wnow 0] * $ymax}]
    set newtop [expr {$wtop + $dir * $linespc}]
    if {$newtop < 0} {
	set newtop 0
    } elseif {$newtop > $ymax} {
	set newtop $ymax
    }
    allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
}

proc selectline {l isnew} {
    global canv canv2 canv3 ctext commitinfo selectedline
    global displayorder linehtag linentag linedtag
    global canvy0 linespc parentlist childlist
    global currentid sha1entry
    global commentend idtags linknum
    global mergemax numcommits pending_select
    global cmitmode

    catch {unset pending_select}
    $canv delete hover
    normalline
    if {$l < 0 || $l >= $numcommits} return
    set y [expr {$canvy0 + $l * $linespc}]
    set ymax [lindex [$canv cget -scrollregion] 3]
    set ytop [expr {$y - $linespc - 1}]
    set ybot [expr {$y + $linespc + 1}]
    set wnow [$canv yview]
    set wtop [expr {[lindex $wnow 0] * $ymax}]
    set wbot [expr {[lindex $wnow 1] * $ymax}]
    set wh [expr {$wbot - $wtop}]
    set newtop $wtop
    if {$ytop < $wtop} {
	if {$ybot < $wtop} {
	    set newtop [expr {$y - $wh / 2.0}]
	} else {
	    set newtop $ytop
	    if {$newtop > $wtop - $linespc} {
		set newtop [expr {$wtop - $linespc}]
	    }
	}
    } elseif {$ybot > $wbot} {
	if {$ytop > $wbot} {
	    set newtop [expr {$y - $wh / 2.0}]
	} else {
	    set newtop [expr {$ybot - $wh}]
	    if {$newtop < $wtop + $linespc} {
		set newtop [expr {$wtop + $linespc}]
	    }
	}
    }
    if {$newtop != $wtop} {
	if {$newtop < 0} {
	    set newtop 0
	}
	allcanvs yview moveto [expr {$newtop * 1.0 / $ymax}]
	drawvisible
    }

    if {![info exists linehtag($l)]} return
    $canv delete secsel
    set t [eval $canv create rect [$canv bbox $linehtag($l)] -outline {{}} \
	       -tags secsel -fill [$canv cget -selectbackground]]
    $canv lower $t
    $canv2 delete secsel
    set t [eval $canv2 create rect [$canv2 bbox $linentag($l)] -outline {{}} \
	       -tags secsel -fill [$canv2 cget -selectbackground]]
    $canv2 lower $t
    $canv3 delete secsel
    set t [eval $canv3 create rect [$canv3 bbox $linedtag($l)] -outline {{}} \
	       -tags secsel -fill [$canv3 cget -selectbackground]]
    $canv3 lower $t

    if {$isnew} {
	addtohistory [list selectline $l 0]
    }

    set selectedline $l

    set id [lindex $displayorder $l]
    set currentid $id
    $sha1entry delete 0 end
    $sha1entry insert 0 $id
    $sha1entry selection from 0
    $sha1entry selection to end

    $ctext conf -state normal
    $ctext delete 0.0 end
    set linknum 0
    set info $commitinfo($id)
    set date [formatdate [lindex $info 2]]
    $ctext insert end "Author: [lindex $info 1]  $date\n"
    set date [formatdate [lindex $info 4]]
    $ctext insert end "Committer: [lindex $info 3]  $date\n"
    if {[info exists idtags($id)]} {
	$ctext insert end "Tags:"
	foreach tag $idtags($id) {
	    $ctext insert end " $tag"
	}
	$ctext insert end "\n"
    }
 
    set comment {}
    set olds [lindex $parentlist $l]
    if {[llength $olds] > 1} {
	set np 0
	foreach p $olds {
	    if {$np >= $mergemax} {
		set tag mmax
	    } else {
		set tag m$np
	    }
	    $ctext insert end "Parent: " $tag
	    appendwithlinks [commit_descriptor $p]
	    incr np
	}
    } else {
	foreach p $olds {
	    append comment "Parent: [commit_descriptor $p]\n"
	}
    }

    foreach c [lindex $childlist $l] {
	append comment "Child:  [commit_descriptor $c]\n"
    }
    append comment "\n"
    append comment [lindex $info 5]

    # make anything that looks like a SHA1 ID be a clickable link
    appendwithlinks $comment

    $ctext tag delete Comments
    $ctext tag remove found 1.0 end
    $ctext conf -state disabled
    set commentend [$ctext index "end - 1c"]

    init_flist "Comments"
    if {$cmitmode eq "tree"} {
	gettree $id
    } elseif {[llength $olds] <= 1} {
	startdiff $id
    } else {
	mergediff $id $l
    }
}

proc selfirstline {} {
    unmarkmatches
    selectline 0 1
}

proc sellastline {} {
    global numcommits
    unmarkmatches
    set l [expr {$numcommits - 1}]
    selectline $l 1
}

proc selnextline {dir} {
    global selectedline
    if {![info exists selectedline]} return
    set l [expr {$selectedline + $dir}]
    unmarkmatches
    selectline $l 1
}

proc selnextpage {dir} {
    global canv linespc selectedline numcommits

    set lpp [expr {([winfo height $canv] - 2) / $linespc}]
    if {$lpp < 1} {
	set lpp 1
    }
    allcanvs yview scroll [expr {$dir * $lpp}] units
    drawvisible
    if {![info exists selectedline]} return
    set l [expr {$selectedline + $dir * $lpp}]
    if {$l < 0} {
	set l 0
    } elseif {$l >= $numcommits} {
        set l [expr $numcommits - 1]
    }
    unmarkmatches
    selectline $l 1    
}

proc unselectline {} {
    global selectedline currentid

    catch {unset selectedline}
    catch {unset currentid}
    allcanvs delete secsel
}

proc reselectline {} {
    global selectedline

    if {[info exists selectedline]} {
	selectline $selectedline 0
    }
}

proc addtohistory {cmd} {
    global history historyindex curview

    set elt [list $curview $cmd]
    if {$historyindex > 0
	&& [lindex $history [expr {$historyindex - 1}]] == $elt} {
	return
    }

    if {$historyindex < [llength $history]} {
	set history [lreplace $history $historyindex end $elt]
    } else {
	lappend history $elt
    }
    incr historyindex
    if {$historyindex > 1} {
	.ctop.top.bar.leftbut conf -state normal
    } else {
	.ctop.top.bar.leftbut conf -state disabled
    }
    .ctop.top.bar.rightbut conf -state disabled
}

proc godo {elt} {
    global curview

    set view [lindex $elt 0]
    set cmd [lindex $elt 1]
    if {$curview != $view} {
	showview $view
    }
    eval $cmd
}

proc goback {} {
    global history historyindex

    if {$historyindex > 1} {
	incr historyindex -1
	godo [lindex $history [expr {$historyindex - 1}]]
	.ctop.top.bar.rightbut conf -state normal
    }
    if {$historyindex <= 1} {
	.ctop.top.bar.leftbut conf -state disabled
    }
}

proc goforw {} {
    global history historyindex

    if {$historyindex < [llength $history]} {
	set cmd [lindex $history $historyindex]
	incr historyindex
	godo $cmd
	.ctop.top.bar.leftbut conf -state normal
    }
    if {$historyindex >= [llength $history]} {
	.ctop.top.bar.rightbut conf -state disabled
    }
}

proc gettree {id} {
    global treefilelist treeidlist diffids diffmergeid treepending

    set diffids $id
    catch {unset diffmergeid}
    if {![info exists treefilelist($id)]} {
	if {![info exists treepending]} {
	    if {[catch {set gtf [open [concat | git-ls-tree -r $id] r]}]} {
		return
	    }
	    set treepending $id
	    set treefilelist($id) {}
	    set treeidlist($id) {}
	    fconfigure $gtf -blocking 0
	    fileevent $gtf readable [list gettreeline $gtf $id]
	}
    } else {
	setfilelist $id
    }
}

proc gettreeline {gtf id} {
    global treefilelist treeidlist treepending cmitmode diffids

    while {[gets $gtf line] >= 0} {
	if {[lindex $line 1] ne "blob"} continue
	set sha1 [lindex $line 2]
	set fname [lindex $line 3]
	lappend treefilelist($id) $fname
	lappend treeidlist($id) $sha1
    }
    if {![eof $gtf]} return
    close $gtf
    unset treepending
    if {$cmitmode ne "tree"} {
	if {![info exists diffmergeid]} {
	    gettreediffs $diffids
	}
    } elseif {$id ne $diffids} {
	gettree $diffids
    } else {
	setfilelist $id
    }
}

proc showfile {f} {
    global treefilelist treeidlist diffids
    global ctext commentend

    set i [lsearch -exact $treefilelist($diffids) $f]
    if {$i < 0} {
	puts "oops, $f not in list for id $diffids"
	return
    }
    set blob [lindex $treeidlist($diffids) $i]
    if {[catch {set bf [open [concat | git-cat-file blob $blob] r]} err]} {
	puts "oops, error reading blob $blob: $err"
	return
    }
    fconfigure $bf -blocking 0
    fileevent $bf readable [list getblobline $bf $diffids]
    $ctext config -state normal
    $ctext delete $commentend end
    $ctext insert end "\n"
    $ctext insert end "$f\n" filesep
    $ctext config -state disabled
    $ctext yview $commentend
}

proc getblobline {bf id} {
    global diffids cmitmode ctext

    if {$id ne $diffids || $cmitmode ne "tree"} {
	catch {close $bf}
	return
    }
    $ctext config -state normal
    while {[gets $bf line] >= 0} {
	$ctext insert end "$line\n"
    }
    if {[eof $bf]} {
	# delete last newline
	$ctext delete "end - 2c" "end - 1c"
	close $bf
    }
    $ctext config -state disabled
}

proc mergediff {id l} {
    global diffmergeid diffopts mdifffd
    global diffids
    global parentlist

    set diffmergeid $id
    set diffids $id
    # this doesn't seem to actually affect anything...
    set env(GIT_DIFF_OPTS) $diffopts
    set cmd [concat | git-diff-tree --no-commit-id --cc $id]
    if {[catch {set mdf [open $cmd r]} err]} {
	error_popup "Error getting merge diffs: $err"
	return
    }
    fconfigure $mdf -blocking 0
    set mdifffd($id) $mdf
    set np [llength [lindex $parentlist $l]]
    fileevent $mdf readable [list getmergediffline $mdf $id $np]
    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
}

proc getmergediffline {mdf id np} {
    global diffmergeid ctext cflist nextupdate mergemax
    global difffilestart mdifffd

    set n [gets $mdf line]
    if {$n < 0} {
	if {[eof $mdf]} {
	    close $mdf
	}
	return
    }
    if {![info exists diffmergeid] || $id != $diffmergeid
	|| $mdf != $mdifffd($id)} {
	return
    }
    $ctext conf -state normal
    if {[regexp {^diff --cc (.*)} $line match fname]} {
	# start of a new file
	$ctext insert end "\n"
	set here [$ctext index "end - 1c"]
	lappend difffilestart $here
	add_flist [list $fname]
	set l [expr {(78 - [string length $fname]) / 2}]
	set pad [string range "----------------------------------------" 1 $l]
	$ctext insert end "$pad $fname $pad\n" filesep
    } elseif {[regexp {^@@} $line]} {
	$ctext insert end "$line\n" hunksep
    } elseif {[regexp {^[0-9a-f]{40}$} $line] || [regexp {^index} $line]} {
	# do nothing
    } else {
	# parse the prefix - one ' ', '-' or '+' for each parent
	set spaces {}
	set minuses {}
	set pluses {}
	set isbad 0
	for {set j 0} {$j < $np} {incr j} {
	    set c [string range $line $j $j]
	    if {$c == " "} {
		lappend spaces $j
	    } elseif {$c == "-"} {
		lappend minuses $j
	    } elseif {$c == "+"} {
		lappend pluses $j
	    } else {
		set isbad 1
		break
	    }
	}
	set tags {}
	set num {}
	if {!$isbad && $minuses ne {} && $pluses eq {}} {
	    # line doesn't appear in result, parents in $minuses have the line
	    set num [lindex $minuses 0]
	} elseif {!$isbad && $pluses ne {} && $minuses eq {}} {
	    # line appears in result, parents in $pluses don't have the line
	    lappend tags mresult
	    set num [lindex $spaces 0]
	}
	if {$num ne {}} {
	    if {$num >= $mergemax} {
		set num "max"
	    }
	    lappend tags m$num
	}
	$ctext insert end "$line\n" $tags
    }
    $ctext conf -state disabled
    if {[clock clicks -milliseconds] >= $nextupdate} {
	incr nextupdate 100
	fileevent $mdf readable {}
	update
	fileevent $mdf readable [list getmergediffline $mdf $id $np]
    }
}

proc startdiff {ids} {
    global treediffs diffids treepending diffmergeid

    set diffids $ids
    catch {unset diffmergeid}
    if {![info exists treediffs($ids)]} {
	if {![info exists treepending]} {
	    gettreediffs $ids
	}
    } else {
	addtocflist $ids
    }
}

proc addtocflist {ids} {
    global treediffs cflist
    add_flist $treediffs($ids)
    getblobdiffs $ids
}

proc gettreediffs {ids} {
    global treediff treepending
    set treepending $ids
    set treediff {}
    if {[catch \
	 {set gdtf [open [concat | git-diff-tree --no-commit-id -r $ids] r]} \
	]} return
    fconfigure $gdtf -blocking 0
    fileevent $gdtf readable [list gettreediffline $gdtf $ids]
}

proc gettreediffline {gdtf ids} {
    global treediff treediffs treepending diffids diffmergeid
    global cmitmode

    set n [gets $gdtf line]
    if {$n < 0} {
	if {![eof $gdtf]} return
	close $gdtf
	set treediffs($ids) $treediff
	unset treepending
	if {$cmitmode eq "tree"} {
	    gettree $diffids
	} elseif {$ids != $diffids} {
	    if {![info exists diffmergeid]} {
		gettreediffs $diffids
	    }
	} else {
	    addtocflist $ids
	}
	return
    }
    set file [lindex $line 5]
    lappend treediff $file
}

proc getblobdiffs {ids} {
    global diffopts blobdifffd diffids env curdifftag curtagstart
    global nextupdate diffinhdr treediffs

    set env(GIT_DIFF_OPTS) $diffopts
    set cmd [concat | git-diff-tree --no-commit-id -r -p -C $ids]
    if {[catch {set bdf [open $cmd r]} err]} {
	puts "error getting diffs: $err"
	return
    }
    set diffinhdr 0
    fconfigure $bdf -blocking 0
    set blobdifffd($ids) $bdf
    set curdifftag Comments
    set curtagstart 0.0
    fileevent $bdf readable [list getblobdiffline $bdf $diffids]
    set nextupdate [expr {[clock clicks -milliseconds] + 100}]
}

proc setinlist {var i val} {
    global $var

    while {[llength [set $var]] < $i} {
	lappend $var {}
    }
    if {[llength [set $var]] == $i} {
	lappend $var $val
    } else {
	lset $var $i $val
    }
}

proc getblobdiffline {bdf ids} {
    global diffids blobdifffd ctext curdifftag curtagstart
    global diffnexthead diffnextnote difffilestart
    global nextupdate diffinhdr treediffs

    set n [gets $bdf line]
    if {$n < 0} {
	if {[eof $bdf]} {
	    close $bdf
	    if {$ids == $diffids && $bdf == $blobdifffd($ids)} {
		$ctext tag add $curdifftag $curtagstart end
	    }
	}
	return
    }
    if {$ids != $diffids || $bdf != $blobdifffd($ids)} {
	return
    }
    $ctext conf -state normal
    if {[regexp {^diff --git a/(.*) b/(.*)} $line match fname newname]} {
	# start of a new file
	$ctext insert end "\n"
	$ctext tag add $curdifftag $curtagstart end
	set here [$ctext index "end - 1c"]
	set curtagstart $here
	set header $newname
	set i [lsearch -exact $treediffs($ids) $fname]
	if {$i >= 0} {
	    setinlist difffilestart $i $here
	}
	if {$newname ne $fname} {
	    set i [lsearch -exact $treediffs($ids) $newname]
	    if {$i >= 0} {
		setinlist difffilestart $i $here
	    }
	}
	set curdifftag "f:$fname"
	$ctext tag delete $curdifftag
	set l [expr {(78 - [string length $header]) / 2}]
	set pad [string range "----------------------------------------" 1 $l]
	$ctext insert end "$pad $header $pad\n" filesep
	set diffinhdr 1
    } elseif {$diffinhdr && [string compare -length 3 $line "---"] == 0} {
	# do nothing
    } elseif {$diffinhdr && [string compare -length 3 $line "+++"] == 0} {
	set diffinhdr 0
    } elseif {[regexp {^@@ -([0-9]+),([0-9]+) \+([0-9]+),([0-9]+) @@(.*)} \
		   $line match f1l f1c f2l f2c rest]} {
	$ctext insert end "$line\n" hunksep
	set diffinhdr 0
    } else {
	set x [string range $line 0 0]
	if {$x == "-" || $x == "+"} {
	    set tag [expr {$x == "+"}]
	    $ctext insert end "$line\n" d$tag
	} elseif {$x == " "} {
	    $ctext insert end "$line\n"
	} elseif {$diffinhdr || $x == "\\"} {
	    # e.g. "\ No newline at end of file"
	    $ctext insert end "$line\n" filesep
	} else {
	    # Something else we don't recognize
	    if {$curdifftag != "Comments"} {
		$ctext insert end "\n"
		$ctext tag add $curdifftag $curtagstart end
		set curtagstart [$ctext index "end - 1c"]
		set curdifftag Comments
	    }
	    $ctext insert end "$line\n" filesep
	}
    }
    $ctext conf -state disabled
    if {[clock clicks -milliseconds] >= $nextupdate} {
	incr nextupdate 100
	fileevent $bdf readable {}
	update
	fileevent $bdf readable "getblobdiffline $bdf {$ids}"
    }
}

proc nextfile {} {
    global difffilestart ctext
    set here [$ctext index @0,0]
    foreach loc $difffilestart {
	if {[$ctext compare $loc > $here]} {
	    $ctext yview $loc
	}
    }
}

proc setcoords {} {
    global linespc charspc canvx0 canvy0 mainfont
    global xspc1 xspc2 lthickness

    set linespc [font metrics $mainfont -linespace]
    set charspc [font measure $mainfont "m"]
    set canvy0 [expr {int(3 + 0.5 * $linespc)}]
    set canvx0 [expr {int(3 + 0.5 * $linespc)}]
    set lthickness [expr {int($linespc / 9) + 1}]
    set xspc1(0) $linespc
    set xspc2 $linespc
}

proc redisplay {} {
    global canv
    global selectedline

    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax eq {} || $ymax == 0} return
    set span [$canv yview]
    clear_display
    setcanvscroll
    allcanvs yview moveto [lindex $span 0]
    drawvisible
    if {[info exists selectedline]} {
	selectline $selectedline 0
    }
}

proc incrfont {inc} {
    global mainfont textfont ctext canv phase
    global stopped entries
    unmarkmatches
    set mainfont [lreplace $mainfont 1 1 [expr {[lindex $mainfont 1] + $inc}]]
    set textfont [lreplace $textfont 1 1 [expr {[lindex $textfont 1] + $inc}]]
    setcoords
    $ctext conf -font $textfont
    $ctext tag conf filesep -font [concat $textfont bold]
    foreach e $entries {
	$e conf -font $mainfont
    }
    if {$phase eq "getcommits"} {
	$canv itemconf textitems -font $mainfont
    }
    redisplay
}

proc clearsha1 {} {
    global sha1entry sha1string
    if {[string length $sha1string] == 40} {
	$sha1entry delete 0 end
    }
}

proc sha1change {n1 n2 op} {
    global sha1string currentid sha1but
    if {$sha1string == {}
	|| ([info exists currentid] && $sha1string == $currentid)} {
	set state disabled
    } else {
	set state normal
    }
    if {[$sha1but cget -state] == $state} return
    if {$state == "normal"} {
	$sha1but conf -state normal -relief raised -text "Goto: "
    } else {
	$sha1but conf -state disabled -relief flat -text "SHA1 ID: "
    }
}

proc gotocommit {} {
    global sha1string currentid commitrow tagids headids
    global displayorder numcommits curview

    if {$sha1string == {}
	|| ([info exists currentid] && $sha1string == $currentid)} return
    if {[info exists tagids($sha1string)]} {
	set id $tagids($sha1string)
    } elseif {[info exists headids($sha1string)]} {
	set id $headids($sha1string)
    } else {
	set id [string tolower $sha1string]
	if {[regexp {^[0-9a-f]{4,39}$} $id]} {
	    set matches {}
	    foreach i $displayorder {
		if {[string match $id* $i]} {
		    lappend matches $i
		}
	    }
	    if {$matches ne {}} {
		if {[llength $matches] > 1} {
		    error_popup "Short SHA1 id $id is ambiguous"
		    return
		}
		set id [lindex $matches 0]
	    }
	}
    }
    if {[info exists commitrow($curview,$id)]} {
	selectline $commitrow($curview,$id) 1
	return
    }
    if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
	set type "SHA1 id"
    } else {
	set type "Tag/Head"
    }
    error_popup "$type $sha1string is not known"
}

proc lineenter {x y id} {
    global hoverx hovery hoverid hovertimer
    global commitinfo canv

    if {![info exists commitinfo($id)] && ![getcommit $id]} return
    set hoverx $x
    set hovery $y
    set hoverid $id
    if {[info exists hovertimer]} {
	after cancel $hovertimer
    }
    set hovertimer [after 500 linehover]
    $canv delete hover
}

proc linemotion {x y id} {
    global hoverx hovery hoverid hovertimer

    if {[info exists hoverid] && $id == $hoverid} {
	set hoverx $x
	set hovery $y
	if {[info exists hovertimer]} {
	    after cancel $hovertimer
	}
	set hovertimer [after 500 linehover]
    }
}

proc lineleave {id} {
    global hoverid hovertimer canv

    if {[info exists hoverid] && $id == $hoverid} {
	$canv delete hover
	if {[info exists hovertimer]} {
	    after cancel $hovertimer
	    unset hovertimer
	}
	unset hoverid
    }
}

proc linehover {} {
    global hoverx hovery hoverid hovertimer
    global canv linespc lthickness
    global commitinfo mainfont

    set text [lindex $commitinfo($hoverid) 0]
    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax == {}} return
    set yfrac [lindex [$canv yview] 0]
    set x [expr {$hoverx + 2 * $linespc}]
    set y [expr {$hovery + $yfrac * $ymax - $linespc / 2}]
    set x0 [expr {$x - 2 * $lthickness}]
    set y0 [expr {$y - 2 * $lthickness}]
    set x1 [expr {$x + [font measure $mainfont $text] + 2 * $lthickness}]
    set y1 [expr {$y + $linespc + 2 * $lthickness}]
    set t [$canv create rectangle $x0 $y0 $x1 $y1 \
	       -fill \#ffff80 -outline black -width 1 -tags hover]
    $canv raise $t
    set t [$canv create text $x $y -anchor nw -text $text -tags hover -font $mainfont]
    $canv raise $t
}

proc clickisonarrow {id y} {
    global lthickness

    set ranges [rowranges $id]
    set thresh [expr {2 * $lthickness + 6}]
    set n [expr {[llength $ranges] - 1}]
    for {set i 1} {$i < $n} {incr i} {
	set row [lindex $ranges $i]
	if {abs([yc $row] - $y) < $thresh} {
	    return $i
	}
    }
    return {}
}

proc arrowjump {id n y} {
    global canv

    # 1 <-> 2, 3 <-> 4, etc...
    set n [expr {(($n - 1) ^ 1) + 1}]
    set row [lindex [rowranges $id] $n]
    set yt [yc $row]
    set ymax [lindex [$canv cget -scrollregion] 3]
    if {$ymax eq {} || $ymax <= 0} return
    set view [$canv yview]
    set yspan [expr {[lindex $view 1] - [lindex $view 0]}]
    set yfrac [expr {$yt / $ymax - $yspan / 2}]
    if {$yfrac < 0} {
	set yfrac 0
    }
    allcanvs yview moveto $yfrac
}

proc lineclick {x y id isnew} {
    global ctext commitinfo children canv thickerline curview

    if {![info exists commitinfo($id)] && ![getcommit $id]} return
    unmarkmatches
    unselectline
    normalline
    $canv delete hover
    # draw this line thicker than normal
    set thickerline $id
    drawlines $id
    if {$isnew} {
	set ymax [lindex [$canv cget -scrollregion] 3]
	if {$ymax eq {}} return
	set yfrac [lindex [$canv yview] 0]
	set y [expr {$y + $yfrac * $ymax}]
    }
    set dirn [clickisonarrow $id $y]
    if {$dirn ne {}} {
	arrowjump $id $dirn $y
	return
    }

    if {$isnew} {
	addtohistory [list lineclick $x $y $id 0]
    }
    # fill the details pane with info about this line
    $ctext conf -state normal
    $ctext delete 0.0 end
    $ctext tag conf link -foreground blue -underline 1
    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
    $ctext insert end "Parent:\t"
    $ctext insert end $id [list link link0]
    $ctext tag bind link0 <1> [list selbyid $id]
    set info $commitinfo($id)
    $ctext insert end "\n\t[lindex $info 0]\n"
    $ctext insert end "\tAuthor:\t[lindex $info 1]\n"
    set date [formatdate [lindex $info 2]]
    $ctext insert end "\tDate:\t$date\n"
    set kids $children($curview,$id)
    if {$kids ne {}} {
	$ctext insert end "\nChildren:"
	set i 0
	foreach child $kids {
	    incr i
	    if {![info exists commitinfo($child)] && ![getcommit $child]} continue
	    set info $commitinfo($child)
	    $ctext insert end "\n\t"
	    $ctext insert end $child [list link link$i]
	    $ctext tag bind link$i <1> [list selbyid $child]
	    $ctext insert end "\n\t[lindex $info 0]"
	    $ctext insert end "\n\tAuthor:\t[lindex $info 1]"
	    set date [formatdate [lindex $info 2]]
	    $ctext insert end "\n\tDate:\t$date\n"
	}
    }
    $ctext conf -state disabled
    init_flist {}
}

proc normalline {} {
    global thickerline
    if {[info exists thickerline]} {
	set id $thickerline
	unset thickerline
	drawlines $id
    }
}

proc selbyid {id} {
    global commitrow curview
    if {[info exists commitrow($curview,$id)]} {
	selectline $commitrow($curview,$id) 1
    }
}

proc mstime {} {
    global startmstime
    if {![info exists startmstime]} {
	set startmstime [clock clicks -milliseconds]
    }
    return [format "%.3f" [expr {([clock click -milliseconds] - $startmstime) / 1000.0}]]
}

proc rowmenu {x y id} {
    global rowctxmenu commitrow selectedline rowmenuid curview

    if {![info exists selectedline]
	|| $commitrow($curview,$id) eq $selectedline} {
	set state disabled
    } else {
	set state normal
    }
    $rowctxmenu entryconfigure 0 -state $state
    $rowctxmenu entryconfigure 1 -state $state
    $rowctxmenu entryconfigure 2 -state $state
    set rowmenuid $id
    tk_popup $rowctxmenu $x $y
}

proc diffvssel {dirn} {
    global rowmenuid selectedline displayorder

    if {![info exists selectedline]} return
    if {$dirn} {
	set oldid [lindex $displayorder $selectedline]
	set newid $rowmenuid
    } else {
	set oldid $rowmenuid
	set newid [lindex $displayorder $selectedline]
    }
    addtohistory [list doseldiff $oldid $newid]
    doseldiff $oldid $newid
}

proc doseldiff {oldid newid} {
    global ctext
    global commitinfo

    $ctext conf -state normal
    $ctext delete 0.0 end
    init_flist "Top"
    $ctext insert end "From "
    $ctext tag conf link -foreground blue -underline 1
    $ctext tag bind link <Enter> { %W configure -cursor hand2 }
    $ctext tag bind link <Leave> { %W configure -cursor $curtextcursor }
    $ctext tag bind link0 <1> [list selbyid $oldid]
    $ctext insert end $oldid [list link link0]
    $ctext insert end "\n     "
    $ctext insert end [lindex $commitinfo($oldid) 0]
    $ctext insert end "\n\nTo   "
    $ctext tag bind link1 <1> [list selbyid $newid]
    $ctext insert end $newid [list link link1]
    $ctext insert end "\n     "
    $ctext insert end [lindex $commitinfo($newid) 0]
    $ctext insert end "\n"
    $ctext conf -state disabled
    $ctext tag delete Comments
    $ctext tag remove found 1.0 end
    startdiff [list $oldid $newid]
}

proc mkpatch {} {
    global rowmenuid currentid commitinfo patchtop patchnum

    if {![info exists currentid]} return
    set oldid $currentid
    set oldhead [lindex $commitinfo($oldid) 0]
    set newid $rowmenuid
    set newhead [lindex $commitinfo($newid) 0]
    set top .patch
    set patchtop $top
    catch {destroy $top}
    toplevel $top
    label $top.title -text "Generate patch"
    grid $top.title - -pady 10
    label $top.from -text "From:"
    entry $top.fromsha1 -width 40 -relief flat
    $top.fromsha1 insert 0 $oldid
    $top.fromsha1 conf -state readonly
    grid $top.from $top.fromsha1 -sticky w
    entry $top.fromhead -width 60 -relief flat
    $top.fromhead insert 0 $oldhead
    $top.fromhead conf -state readonly
    grid x $top.fromhead -sticky w
    label $top.to -text "To:"
    entry $top.tosha1 -width 40 -relief flat
    $top.tosha1 insert 0 $newid
    $top.tosha1 conf -state readonly
    grid $top.to $top.tosha1 -sticky w
    entry $top.tohead -width 60 -relief flat
    $top.tohead insert 0 $newhead
    $top.tohead conf -state readonly
    grid x $top.tohead -sticky w
    button $top.rev -text "Reverse" -command mkpatchrev -padx 5
    grid $top.rev x -pady 10
    label $top.flab -text "Output file:"
    entry $top.fname -width 60
    $top.fname insert 0 [file normalize "patch$patchnum.patch"]
    incr patchnum
    grid $top.flab $top.fname -sticky w
    frame $top.buts
    button $top.buts.gen -text "Generate" -command mkpatchgo
    button $top.buts.can -text "Cancel" -command mkpatchcan
    grid $top.buts.gen $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - -pady 10 -sticky ew
    focus $top.fname
}

proc mkpatchrev {} {
    global patchtop

    set oldid [$patchtop.fromsha1 get]
    set oldhead [$patchtop.fromhead get]
    set newid [$patchtop.tosha1 get]
    set newhead [$patchtop.tohead get]
    foreach e [list fromsha1 fromhead tosha1 tohead] \
	    v [list $newid $newhead $oldid $oldhead] {
	$patchtop.$e conf -state normal
	$patchtop.$e delete 0 end
	$patchtop.$e insert 0 $v
	$patchtop.$e conf -state readonly
    }
}

proc mkpatchgo {} {
    global patchtop

    set oldid [$patchtop.fromsha1 get]
    set newid [$patchtop.tosha1 get]
    set fname [$patchtop.fname get]
    if {[catch {exec git-diff-tree -p $oldid $newid >$fname &} err]} {
	error_popup "Error creating patch: $err"
    }
    catch {destroy $patchtop}
    unset patchtop
}

proc mkpatchcan {} {
    global patchtop

    catch {destroy $patchtop}
    unset patchtop
}

proc mktag {} {
    global rowmenuid mktagtop commitinfo

    set top .maketag
    set mktagtop $top
    catch {destroy $top}
    toplevel $top
    label $top.title -text "Create tag"
    grid $top.title - -pady 10
    label $top.id -text "ID:"
    entry $top.sha1 -width 40 -relief flat
    $top.sha1 insert 0 $rowmenuid
    $top.sha1 conf -state readonly
    grid $top.id $top.sha1 -sticky w
    entry $top.head -width 60 -relief flat
    $top.head insert 0 [lindex $commitinfo($rowmenuid) 0]
    $top.head conf -state readonly
    grid x $top.head -sticky w
    label $top.tlab -text "Tag name:"
    entry $top.tag -width 60
    grid $top.tlab $top.tag -sticky w
    frame $top.buts
    button $top.buts.gen -text "Create" -command mktaggo
    button $top.buts.can -text "Cancel" -command mktagcan
    grid $top.buts.gen $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - -pady 10 -sticky ew
    focus $top.tag
}

proc domktag {} {
    global mktagtop env tagids idtags

    set id [$mktagtop.sha1 get]
    set tag [$mktagtop.tag get]
    if {$tag == {}} {
	error_popup "No tag name specified"
	return
    }
    if {[info exists tagids($tag)]} {
	error_popup "Tag \"$tag\" already exists"
	return
    }
    if {[catch {
	set dir [gitdir]
	set fname [file join $dir "refs/tags" $tag]
	set f [open $fname w]
	puts $f $id
	close $f
    } err]} {
	error_popup "Error creating tag: $err"
	return
    }

    set tagids($tag) $id
    lappend idtags($id) $tag
    redrawtags $id
}

proc redrawtags {id} {
    global canv linehtag commitrow idpos selectedline curview

    if {![info exists commitrow($curview,$id)]} return
    drawcmitrow $commitrow($curview,$id)
    $canv delete tag.$id
    set xt [eval drawtags $id $idpos($id)]
    $canv coords $linehtag($commitrow($curview,$id)) $xt [lindex $idpos($id) 2]
    if {[info exists selectedline]
	&& $selectedline == $commitrow($curview,$id)} {
	selectline $selectedline 0
    }
}

proc mktagcan {} {
    global mktagtop

    catch {destroy $mktagtop}
    unset mktagtop
}

proc mktaggo {} {
    domktag
    mktagcan
}

proc writecommit {} {
    global rowmenuid wrcomtop commitinfo wrcomcmd

    set top .writecommit
    set wrcomtop $top
    catch {destroy $top}
    toplevel $top
    label $top.title -text "Write commit to file"
    grid $top.title - -pady 10
    label $top.id -text "ID:"
    entry $top.sha1 -width 40 -relief flat
    $top.sha1 insert 0 $rowmenuid
    $top.sha1 conf -state readonly
    grid $top.id $top.sha1 -sticky w
    entry $top.head -width 60 -relief flat
    $top.head insert 0 [lindex $commitinfo($rowmenuid) 0]
    $top.head conf -state readonly
    grid x $top.head -sticky w
    label $top.clab -text "Command:"
    entry $top.cmd -width 60 -textvariable wrcomcmd
    grid $top.clab $top.cmd -sticky w -pady 10
    label $top.flab -text "Output file:"
    entry $top.fname -width 60
    $top.fname insert 0 [file normalize "commit-[string range $rowmenuid 0 6]"]
    grid $top.flab $top.fname -sticky w
    frame $top.buts
    button $top.buts.gen -text "Write" -command wrcomgo
    button $top.buts.can -text "Cancel" -command wrcomcan
    grid $top.buts.gen $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - -pady 10 -sticky ew
    focus $top.fname
}

proc wrcomgo {} {
    global wrcomtop

    set id [$wrcomtop.sha1 get]
    set cmd "echo $id | [$wrcomtop.cmd get]"
    set fname [$wrcomtop.fname get]
    if {[catch {exec sh -c $cmd >$fname &} err]} {
	error_popup "Error writing commit: $err"
    }
    catch {destroy $wrcomtop}
    unset wrcomtop
}

proc wrcomcan {} {
    global wrcomtop

    catch {destroy $wrcomtop}
    unset wrcomtop
}

proc listrefs {id} {
    global idtags idheads idotherrefs

    set x {}
    if {[info exists idtags($id)]} {
	set x $idtags($id)
    }
    set y {}
    if {[info exists idheads($id)]} {
	set y $idheads($id)
    }
    set z {}
    if {[info exists idotherrefs($id)]} {
	set z $idotherrefs($id)
    }
    return [list $x $y $z]
}

proc rereadrefs {} {
    global idtags idheads idotherrefs

    set refids [concat [array names idtags] \
		    [array names idheads] [array names idotherrefs]]
    foreach id $refids {
	if {![info exists ref($id)]} {
	    set ref($id) [listrefs $id]
	}
    }
    readrefs
    set refids [lsort -unique [concat $refids [array names idtags] \
			[array names idheads] [array names idotherrefs]]]
    foreach id $refids {
	set v [listrefs $id]
	if {![info exists ref($id)] || $ref($id) != $v} {
	    redrawtags $id
	}
    }
}

proc showtag {tag isnew} {
    global ctext tagcontents tagids linknum

    if {$isnew} {
	addtohistory [list showtag $tag 0]
    }
    $ctext conf -state normal
    $ctext delete 0.0 end
    set linknum 0
    if {[info exists tagcontents($tag)]} {
	set text $tagcontents($tag)
    } else {
	set text "Tag: $tag\nId:  $tagids($tag)"
    }
    appendwithlinks $text
    $ctext conf -state disabled
    init_flist {}
}

proc doquit {} {
    global stopped
    set stopped 100
    destroy .
}

proc doprefs {} {
    global maxwidth maxgraphpct diffopts findmergefiles
    global oldprefs prefstop

    set top .gitkprefs
    set prefstop $top
    if {[winfo exists $top]} {
	raise $top
	return
    }
    foreach v {maxwidth maxgraphpct diffopts findmergefiles} {
	set oldprefs($v) [set $v]
    }
    toplevel $top
    wm title $top "Gitk preferences"
    label $top.ldisp -text "Commit list display options"
    grid $top.ldisp - -sticky w -pady 10
    label $top.spacer -text " "
    label $top.maxwidthl -text "Maximum graph width (lines)" \
	-font optionfont
    spinbox $top.maxwidth -from 0 -to 100 -width 4 -textvariable maxwidth
    grid $top.spacer $top.maxwidthl $top.maxwidth -sticky w
    label $top.maxpctl -text "Maximum graph width (% of pane)" \
	-font optionfont
    spinbox $top.maxpct -from 1 -to 100 -width 4 -textvariable maxgraphpct
    grid x $top.maxpctl $top.maxpct -sticky w
    checkbutton $top.findm -variable findmergefiles
    label $top.findml -text "Include merges for \"Find\" in \"Files\"" \
	-font optionfont
    grid $top.findm $top.findml - -sticky w
    label $top.ddisp -text "Diff display options"
    grid $top.ddisp - -sticky w -pady 10
    label $top.diffoptl -text "Options for diff program" \
	-font optionfont
    entry $top.diffopt -width 20 -textvariable diffopts
    grid x $top.diffoptl $top.diffopt -sticky w
    frame $top.buts
    button $top.buts.ok -text "OK" -command prefsok
    button $top.buts.can -text "Cancel" -command prefscan
    grid $top.buts.ok $top.buts.can
    grid columnconfigure $top.buts 0 -weight 1 -uniform a
    grid columnconfigure $top.buts 1 -weight 1 -uniform a
    grid $top.buts - - -pady 10 -sticky ew
}

proc prefscan {} {
    global maxwidth maxgraphpct diffopts findmergefiles
    global oldprefs prefstop

    foreach v {maxwidth maxgraphpct diffopts findmergefiles} {
	set $v $oldprefs($v)
    }
    catch {destroy $prefstop}
    unset prefstop
}

proc prefsok {} {
    global maxwidth maxgraphpct
    global oldprefs prefstop

    catch {destroy $prefstop}
    unset prefstop
    if {$maxwidth != $oldprefs(maxwidth)
	|| $maxgraphpct != $oldprefs(maxgraphpct)} {
	redisplay
    }
}

proc formatdate {d} {
    return [clock format $d -format "%Y-%m-%d %H:%M:%S"]
}

# This list of encoding names and aliases is distilled from
# http://www.iana.org/assignments/character-sets.
# Not all of them are supported by Tcl.
set encoding_aliases {
    { ANSI_X3.4-1968 iso-ir-6 ANSI_X3.4-1986 ISO_646.irv:1991 ASCII
      ISO646-US US-ASCII us IBM367 cp367 csASCII }
    { ISO-10646-UTF-1 csISO10646UTF1 }
    { ISO_646.basic:1983 ref csISO646basic1983 }
    { INVARIANT csINVARIANT }
    { ISO_646.irv:1983 iso-ir-2 irv csISO2IntlRefVersion }
    { BS_4730 iso-ir-4 ISO646-GB gb uk csISO4UnitedKingdom }
    { NATS-SEFI iso-ir-8-1 csNATSSEFI }
    { NATS-SEFI-ADD iso-ir-8-2 csNATSSEFIADD }
    { NATS-DANO iso-ir-9-1 csNATSDANO }
    { NATS-DANO-ADD iso-ir-9-2 csNATSDANOADD }
    { SEN_850200_B iso-ir-10 FI ISO646-FI ISO646-SE se csISO10Swedish }
    { SEN_850200_C iso-ir-11 ISO646-SE2 se2 csISO11SwedishForNames }
    { KS_C_5601-1987 iso-ir-149 KS_C_5601-1989 KSC_5601 korean csKSC56011987 }
    { ISO-2022-KR csISO2022KR }
    { EUC-KR csEUCKR }
    { ISO-2022-JP csISO2022JP }
    { ISO-2022-JP-2 csISO2022JP2 }
    { JIS_C6220-1969-jp JIS_C6220-1969 iso-ir-13 katakana x0201-7
      csISO13JISC6220jp }
    { JIS_C6220-1969-ro iso-ir-14 jp ISO646-JP csISO14JISC6220ro }
    { IT iso-ir-15 ISO646-IT csISO15Italian }
    { PT iso-ir-16 ISO646-PT csISO16Portuguese }
    { ES iso-ir-17 ISO646-ES csISO17Spanish }
    { greek7-old iso-ir-18 csISO18Greek7Old }
    { latin-greek iso-ir-19 csISO19LatinGreek }
    { DIN_66003 iso-ir-21 de ISO646-DE csISO21German }
    { NF_Z_62-010_(1973) iso-ir-25 ISO646-FR1 csISO25French }
    { Latin-greek-1 iso-ir-27 csISO27LatinGreek1 }
    { ISO_5427 iso-ir-37 csISO5427Cyrillic }
    { JIS_C6226-1978 iso-ir-42 csISO42JISC62261978 }
    { BS_viewdata iso-ir-47 csISO47BSViewdata }
    { INIS iso-ir-49 csISO49INIS }
    { INIS-8 iso-ir-50 csISO50INIS8 }
    { INIS-cyrillic iso-ir-51 csISO51INISCyrillic }
    { ISO_5427:1981 iso-ir-54 ISO5427Cyrillic1981 }
    { ISO_5428:1980 iso-ir-55 csISO5428Greek }
    { GB_1988-80 iso-ir-57 cn ISO646-CN csISO57GB1988 }
    { GB_2312-80 iso-ir-58 chinese csISO58GB231280 }
    { NS_4551-1 iso-ir-60 ISO646-NO no csISO60DanishNorwegian
      csISO60Norwegian1 }
    { NS_4551-2 ISO646-NO2 iso-ir-61 no2 csISO61Norwegian2 }
    { NF_Z_62-010 iso-ir-69 ISO646-FR fr csISO69French }
    { videotex-suppl iso-ir-70 csISO70VideotexSupp1 }
    { PT2 iso-ir-84 ISO646-PT2 csISO84Portuguese2 }
    { ES2 iso-ir-85 ISO646-ES2 csISO85Spanish2 }
    { MSZ_7795.3 iso-ir-86 ISO646-HU hu csISO86Hungarian }
    { JIS_C6226-1983 iso-ir-87 x0208 JIS_X0208-1983 csISO87JISX0208 }
    { greek7 iso-ir-88 csISO88Greek7 }
    { ASMO_449 ISO_9036 arabic7 iso-ir-89 csISO89ASMO449 }
    { iso-ir-90 csISO90 }
    { JIS_C6229-1984-a iso-ir-91 jp-ocr-a csISO91JISC62291984a }
    { JIS_C6229-1984-b iso-ir-92 ISO646-JP-OCR-B jp-ocr-b
      csISO92JISC62991984b }
    { JIS_C6229-1984-b-add iso-ir-93 jp-ocr-b-add csISO93JIS62291984badd }
    { JIS_C6229-1984-hand iso-ir-94 jp-ocr-hand csISO94JIS62291984hand }
    { JIS_C6229-1984-hand-add iso-ir-95 jp-ocr-hand-add
      csISO95JIS62291984handadd }
    { JIS_C6229-1984-kana iso-ir-96 csISO96JISC62291984kana }
    { ISO_2033-1983 iso-ir-98 e13b csISO2033 }
    { ANSI_X3.110-1983 iso-ir-99 CSA_T500-1983 NAPLPS csISO99NAPLPS }
    { ISO_8859-1:1987 iso-ir-100 ISO_8859-1 ISO-8859-1 latin1 l1 IBM819
      CP819 csISOLatin1 }
    { ISO_8859-2:1987 iso-ir-101 ISO_8859-2 ISO-8859-2 latin2 l2 csISOLatin2 }
    { T.61-7bit iso-ir-102 csISO102T617bit }
    { T.61-8bit T.61 iso-ir-103 csISO103T618bit }
    { ISO_8859-3:1988 iso-ir-109 ISO_8859-3 ISO-8859-3 latin3 l3 csISOLatin3 }
    { ISO_8859-4:1988 iso-ir-110 ISO_8859-4 ISO-8859-4 latin4 l4 csISOLatin4 }
    { ECMA-cyrillic iso-ir-111 KOI8-E csISO111ECMACyrillic }
    { CSA_Z243.4-1985-1 iso-ir-121 ISO646-CA csa7-1 ca csISO121Canadian1 }
    { CSA_Z243.4-1985-2 iso-ir-122 ISO646-CA2 csa7-2 csISO122Canadian2 }
    { CSA_Z243.4-1985-gr iso-ir-123 csISO123CSAZ24341985gr }
    { ISO_8859-6:1987 iso-ir-127 ISO_8859-6 ISO-8859-6 ECMA-114 ASMO-708
      arabic csISOLatinArabic }
    { ISO_8859-6-E csISO88596E ISO-8859-6-E }
    { ISO_8859-6-I csISO88596I ISO-8859-6-I }
    { ISO_8859-7:1987 iso-ir-126 ISO_8859-7 ISO-8859-7 ELOT_928 ECMA-118
      greek greek8 csISOLatinGreek }
    { T.101-G2 iso-ir-128 csISO128T101G2 }
    { ISO_8859-8:1988 iso-ir-138 ISO_8859-8 ISO-8859-8 hebrew
      csISOLatinHebrew }
    { ISO_8859-8-E csISO88598E ISO-8859-8-E }
    { ISO_8859-8-I csISO88598I ISO-8859-8-I }
    { CSN_369103 iso-ir-139 csISO139CSN369103 }
    { JUS_I.B1.002 iso-ir-141 ISO646-YU js yu csISO141JUSIB1002 }
    { ISO_6937-2-add iso-ir-142 csISOTextComm }
    { IEC_P27-1 iso-ir-143 csISO143IECP271 }
    { ISO_8859-5:1988 iso-ir-144 ISO_8859-5 ISO-8859-5 cyrillic
      csISOLatinCyrillic }
    { JUS_I.B1.003-serb iso-ir-146 serbian csISO146Serbian }
    { JUS_I.B1.003-mac macedonian iso-ir-147 csISO147Macedonian }
    { ISO_8859-9:1989 iso-ir-148 ISO_8859-9 ISO-8859-9 latin5 l5 csISOLatin5 }
    { greek-ccitt iso-ir-150 csISO150 csISO150GreekCCITT }
    { NC_NC00-10:81 cuba iso-ir-151 ISO646-CU csISO151Cuba }
    { ISO_6937-2-25 iso-ir-152 csISO6937Add }
    { GOST_19768-74 ST_SEV_358-88 iso-ir-153 csISO153GOST1976874 }
    { ISO_8859-supp iso-ir-154 latin1-2-5 csISO8859Supp }
    { ISO_10367-box iso-ir-155 csISO10367Box }
    { ISO-8859-10 iso-ir-157 l6 ISO_8859-10:1992 csISOLatin6 latin6 }
    { latin-lap lap iso-ir-158 csISO158Lap }
    { JIS_X0212-1990 x0212 iso-ir-159 csISO159JISX02121990 }
    { DS_2089 DS2089 ISO646-DK dk csISO646Danish }
    { us-dk csUSDK }
    { dk-us csDKUS }
    { JIS_X0201 X0201 csHalfWidthKatakana }
    { KSC5636 ISO646-KR csKSC5636 }
    { ISO-10646-UCS-2 csUnicode }
    { ISO-10646-UCS-4 csUCS4 }
    { DEC-MCS dec csDECMCS }
    { hp-roman8 roman8 r8 csHPRoman8 }
    { macintosh mac csMacintosh }
    { IBM037 cp037 ebcdic-cp-us ebcdic-cp-ca ebcdic-cp-wt ebcdic-cp-nl
      csIBM037 }
    { IBM038 EBCDIC-INT cp038 csIBM038 }
    { IBM273 CP273 csIBM273 }
    { IBM274 EBCDIC-BE CP274 csIBM274 }
    { IBM275 EBCDIC-BR cp275 csIBM275 }
    { IBM277 EBCDIC-CP-DK EBCDIC-CP-NO csIBM277 }
    { IBM278 CP278 ebcdic-cp-fi ebcdic-cp-se csIBM278 }
    { IBM280 CP280 ebcdic-cp-it csIBM280 }
    { IBM281 EBCDIC-JP-E cp281 csIBM281 }
    { IBM284 CP284 ebcdic-cp-es csIBM284 }
    { IBM285 CP285 ebcdic-cp-gb csIBM285 }
    { IBM290 cp290 EBCDIC-JP-kana csIBM290 }
    { IBM297 cp297 ebcdic-cp-fr csIBM297 }
    { IBM420 cp420 ebcdic-cp-ar1 csIBM420 }
    { IBM423 cp423 ebcdic-cp-gr csIBM423 }
    { IBM424 cp424 ebcdic-cp-he csIBM424 }
    { IBM437 cp437 437 csPC8CodePage437 }
    { IBM500 CP500 ebcdic-cp-be ebcdic-cp-ch csIBM500 }
    { IBM775 cp775 csPC775Baltic }
    { IBM850 cp850 850 csPC850Multilingual }
    { IBM851 cp851 851 csIBM851 }
    { IBM852 cp852 852 csPCp852 }
    { IBM855 cp855 855 csIBM855 }
    { IBM857 cp857 857 csIBM857 }
    { IBM860 cp860 860 csIBM860 }
    { IBM861 cp861 861 cp-is csIBM861 }
    { IBM862 cp862 862 csPC862LatinHebrew }
    { IBM863 cp863 863 csIBM863 }
    { IBM864 cp864 csIBM864 }
    { IBM865 cp865 865 csIBM865 }
    { IBM866 cp866 866 csIBM866 }
    { IBM868 CP868 cp-ar csIBM868 }
    { IBM869 cp869 869 cp-gr csIBM869 }
    { IBM870 CP870 ebcdic-cp-roece ebcdic-cp-yu csIBM870 }
    { IBM871 CP871 ebcdic-cp-is csIBM871 }
    { IBM880 cp880 EBCDIC-Cyrillic csIBM880 }
    { IBM891 cp891 csIBM891 }
    { IBM903 cp903 csIBM903 }
    { IBM904 cp904 904 csIBBM904 }
    { IBM905 CP905 ebcdic-cp-tr csIBM905 }
    { IBM918 CP918 ebcdic-cp-ar2 csIBM918 }
    { IBM1026 CP1026 csIBM1026 }
    { EBCDIC-AT-DE csIBMEBCDICATDE }
    { EBCDIC-AT-DE-A csEBCDICATDEA }
    { EBCDIC-CA-FR csEBCDICCAFR }
    { EBCDIC-DK-NO csEBCDICDKNO }
    { EBCDIC-DK-NO-A csEBCDICDKNOA }
    { EBCDIC-FI-SE csEBCDICFISE }
    { EBCDIC-FI-SE-A csEBCDICFISEA }
    { EBCDIC-FR csEBCDICFR }
    { EBCDIC-IT csEBCDICIT }
    { EBCDIC-PT csEBCDICPT }
    { EBCDIC-ES csEBCDICES }
    { EBCDIC-ES-A csEBCDICESA }
    { EBCDIC-ES-S csEBCDICESS }
    { EBCDIC-UK csEBCDICUK }
    { EBCDIC-US csEBCDICUS }
    { UNKNOWN-8BIT csUnknown8BiT }
    { MNEMONIC csMnemonic }
    { MNEM csMnem }
    { VISCII csVISCII }
    { VIQR csVIQR }
    { KOI8-R csKOI8R }
    { IBM00858 CCSID00858 CP00858 PC-Multilingual-850+euro }
    { IBM00924 CCSID00924 CP00924 ebcdic-Latin9--euro }
    { IBM01140 CCSID01140 CP01140 ebcdic-us-37+euro }
    { IBM01141 CCSID01141 CP01141 ebcdic-de-273+euro }
    { IBM01142 CCSID01142 CP01142 ebcdic-dk-277+euro ebcdic-no-277+euro }
    { IBM01143 CCSID01143 CP01143 ebcdic-fi-278+euro ebcdic-se-278+euro }
    { IBM01144 CCSID01144 CP01144 ebcdic-it-280+euro }
    { IBM01145 CCSID01145 CP01145 ebcdic-es-284+euro }
    { IBM01146 CCSID01146 CP01146 ebcdic-gb-285+euro }
    { IBM01147 CCSID01147 CP01147 ebcdic-fr-297+euro }
    { IBM01148 CCSID01148 CP01148 ebcdic-international-500+euro }
    { IBM01149 CCSID01149 CP01149 ebcdic-is-871+euro }
    { IBM1047 IBM-1047 }
    { PTCP154 csPTCP154 PT154 CP154 Cyrillic-Asian }
    { Amiga-1251 Ami1251 Amiga1251 Ami-1251 }
    { UNICODE-1-1 csUnicode11 }
    { CESU-8 csCESU-8 }
    { BOCU-1 csBOCU-1 }
    { UNICODE-1-1-UTF-7 csUnicode11UTF7 }
    { ISO-8859-14 iso-ir-199 ISO_8859-14:1998 ISO_8859-14 latin8 iso-celtic
      l8 }
    { ISO-8859-15 ISO_8859-15 Latin-9 }
    { ISO-8859-16 iso-ir-226 ISO_8859-16:2001 ISO_8859-16 latin10 l10 }
    { GBK CP936 MS936 windows-936 }
    { JIS_Encoding csJISEncoding }
    { Shift_JIS MS_Kanji csShiftJIS }
    { Extended_UNIX_Code_Packed_Format_for_Japanese csEUCPkdFmtJapanese
      EUC-JP }
    { Extended_UNIX_Code_Fixed_Width_for_Japanese csEUCFixWidJapanese }
    { ISO-10646-UCS-Basic csUnicodeASCII }
    { ISO-10646-Unicode-Latin1 csUnicodeLatin1 ISO-10646 }
    { ISO-Unicode-IBM-1261 csUnicodeIBM1261 }
    { ISO-Unicode-IBM-1268 csUnicodeIBM1268 }
    { ISO-Unicode-IBM-1276 csUnicodeIBM1276 }
    { ISO-Unicode-IBM-1264 csUnicodeIBM1264 }
    { ISO-Unicode-IBM-1265 csUnicodeIBM1265 }
    { ISO-8859-1-Windows-3.0-Latin-1 csWindows30Latin1 }
    { ISO-8859-1-Windows-3.1-Latin-1 csWindows31Latin1 }
    { ISO-8859-2-Windows-Latin-2 csWindows31Latin2 }
    { ISO-8859-9-Windows-Latin-5 csWindows31Latin5 }
    { Adobe-Standard-Encoding csAdobeStandardEncoding }
    { Ventura-US csVenturaUS }
    { Ventura-International csVenturaInternational }
    { PC8-Danish-Norwegian csPC8DanishNorwegian }
    { PC8-Turkish csPC8Turkish }
    { IBM-Symbols csIBMSymbols }
    { IBM-Thai csIBMThai }
    { HP-Legal csHPLegal }
    { HP-Pi-font csHPPiFont }
    { HP-Math8 csHPMath8 }
    { Adobe-Symbol-Encoding csHPPSMath }
    { HP-DeskTop csHPDesktop }
    { Ventura-Math csVenturaMath }
    { Microsoft-Publishing csMicrosoftPublishing }
    { Windows-31J csWindows31J }
    { GB2312 csGB2312 }
    { Big5 csBig5 }
}

proc tcl_encoding {enc} {
    global encoding_aliases
    set names [encoding names]
    set lcnames [string tolower $names]
    set enc [string tolower $enc]
    set i [lsearch -exact $lcnames $enc]
    if {$i < 0} {
	# look for "isonnn" instead of "iso-nnn" or "iso_nnn"
	if {[regsub {^iso[-_]} $enc iso encx]} {
	    set i [lsearch -exact $lcnames $encx]
	}
    }
    if {$i < 0} {
	foreach l $encoding_aliases {
	    set ll [string tolower $l]
	    if {[lsearch -exact $ll $enc] < 0} continue
	    # look through the aliases for one that tcl knows about
	    foreach e $ll {
		set i [lsearch -exact $lcnames $e]
		if {$i < 0} {
		    if {[regsub {^iso[-_]} $e iso ex]} {
			set i [lsearch -exact $lcnames $ex]
		    }
		}
		if {$i >= 0} break
	    }
	    break
	}
    }
    if {$i >= 0} {
	return [lindex $names $i]
    }
    return {}
}

# defaults...
set datemode 0
set diffopts "-U 5 -p"
set wrcomcmd "git-diff-tree --stdin -p --pretty"

set gitencoding {}
catch {
    set gitencoding [exec git-repo-config --get i18n.commitencoding]
}
if {$gitencoding == ""} {
    set gitencoding "utf-8"
}
set tclencoding [tcl_encoding $gitencoding]
if {$tclencoding == {}} {
    puts stderr "Warning: encoding $gitencoding is not supported by Tcl/Tk"
}

set mainfont {Helvetica 9}
set textfont {Courier 9}
set uifont {Helvetica 9 bold}
set findmergefiles 0
set maxgraphpct 50
set maxwidth 16
set revlistorder 0
set fastdate 0
set uparrowlen 7
set downarrowlen 7
set mingaplen 30
set cmitmode "patch"

set colors {green red blue magenta darkgrey brown orange}

catch {source ~/.gitk}

font create optionfont -family sans-serif -size -12

set revtreeargs {}
foreach arg $argv {
    switch -regexp -- $arg {
	"^$" { }
	"^-d" { set datemode 1 }
	default {
	    lappend revtreeargs $arg
	}
    }
}

# check that we can find a .git directory somewhere...
set gitdir [gitdir]
if {![file isdirectory $gitdir]} {
    show_error . "Cannot find the git directory \"$gitdir\"."
    exit 1
}

set cmdline_files {}
set i [lsearch -exact $revtreeargs "--"]
if {$i >= 0} {
    set cmdline_files [lrange $revtreeargs [expr {$i + 1}] end]
    set revtreeargs [lrange $revtreeargs 0 [expr {$i - 1}]]
} elseif {$revtreeargs ne {}} {
    if {[catch {
	set f [eval exec git-rev-parse --no-revs --no-flags $revtreeargs]
	set cmdline_files [split $f "\n"]
	set n [llength $cmdline_files]
	set revtreeargs [lrange $revtreeargs 0 end-$n]
    } err]} {
	# unfortunately we get both stdout and stderr in $err,
	# so look for "fatal:".
	set i [string first "fatal:" $err]
	if {$i > 0} {
	    set err [string range [expr {$i + 6}] end]
	}
	show_error . "Bad arguments to gitk:\n$err"
	exit 1
    }
}

set history {}
set historyindex 0
set fh_serial 0
set highlight_names {}
set nhl_names {}
set highlight_paths {}

set optim_delay 16

set nextviewnum 1
set curview 0
set selectedview 0
set selectedhlview None
set viewfiles(0) {}
set viewperm(0) 0
set viewargs(0) {}

set cmdlineok 0
set stopped 0
set stuffsaved 0
set patchnum 0
setcoords
makewindow
readrefs

if {$cmdline_files ne {} || $revtreeargs ne {}} {
    # create a view for the files/dirs specified on the command line
    set curview 1
    set selectedview 1
    set nextviewnum 2
    set viewname(1) "Command line"
    set viewfiles(1) $cmdline_files
    set viewargs(1) $revtreeargs
    set viewperm(1) 0
    addviewmenu 1
    .bar.view entryconf 2 -state normal
    .bar.view entryconf 3 -state normal
}

if {[info exists permviews]} {
    foreach v $permviews {
	set n $nextviewnum
	incr nextviewnum
	set viewname($n) [lindex $v 0]
	set viewfiles($n) [lindex $v 1]
	set viewargs($n) [lindex $v 2]
	set viewperm($n) 1
	addviewmenu $n
    }
}
getcommits